Add on-demand plugin support.

The Settings object now has an on-demand flag for plugins (this was to avoid
more edits to webkit code). If plugins are on-demand and a plugin is installed
that can handle the content, insert a placeholder widget. If the user clicks on
the placeholder, the plugin will be enabled.

The widget currently does not clip the context correctly. It only clips based on
the widget frame. This is due to a bug (already filed) where the scroll offset
is producing bad clip rectangles.

Requires a framework change.

Bug: 2411524
Change-Id: If3931da8da2339a2385ae78b609c49fa069892ab

3 files changed, 138 insertions, 20 deletions

diff --git a/WebKit/android/WebCoreSupport/FrameLoaderClientAndroid.cpp b/WebKit/android/WebCoreSupport/FrameLoaderClientAndroid.cpp
index 6e42d47..5fb7d29 100644
--- a/WebKit/android/WebCoreSupport/FrameLoaderClientAndroid.cpp
+++ b/WebKit/android/WebCoreSupport/FrameLoaderClientAndroid.cpp
@@ -53,6 +53,7 @@
 #include "PlatformString.h"
 #include "PluginDatabase.h"
 #include "PluginView.h"
+#include "PluginWidget.h"
 #include "ProgressTracker.h"
 #include "RenderPart.h"
 #include "ResourceError.h"
@@ -1000,6 +1001,93 @@ static bool isYouTubeInstalled() {
     return WebCore::packageNotifier().isPackageInstalled("com.google.android.youtube");
 }
 
+// Use PluginWidget as it is not used by Android for real plugins.
+class PluginToggleWidget : public PluginWidget {
+public:
+    PluginToggleWidget(Frame* parent, const IntSize& size,
+            HTMLPlugInElement* elem, const KURL& url,
+            const WTF::Vector<String>& paramNames,
+            const WTF::Vector<String>& paramValues, const String& mimeType,
+            bool loadManually)
+        : m_parent(parent)
+        , m_size(size)
+        , m_element(elem)
+        , m_url(url)
+        , m_paramNames(paramNames)
+        , m_paramValues(paramValues)
+        , m_mimeType(mimeType)
+        , m_loadManually(loadManually)
+    {
+        resize(size);
+    }
+
+    virtual void paint(GraphicsContext* ctx, const IntRect& rect)
+    {
+        // Most of this code is copied from PluginView::paintMissingPluginIcon
+        // with slight modification.
+
+        static RefPtr<Image> image;
+        static RefPtr<Image> bg;
+        if (!image || !bg) {
+            image = Image::loadPlatformResource("togglePlugin");
+            bg = Image::loadPlatformResource("togglePluginBg");
+        }
+
+        IntRect imageRect(x(), y(), image->width(), image->height());
+
+        int xOffset = (width() - imageRect.width()) >> 1;
+        int yOffset = (height() - imageRect.height()) >> 1;
+
+        imageRect.move(xOffset, yOffset);
+
+        if (!rect.intersects(imageRect))
+            return;
+
+        // FIXME: We need to clip similarly to paintMissingPluginIcon but it is
+        // way screwed up right now. It has something to do with how we tell
+        // webkit the scroll position and it causes the placeholder to get
+        // clipped very badly. http://b/issue?id=2533303
+
+        ctx->save();
+        ctx->clip(frameRect());
+        ctx->drawTiledImage(bg.get(), DeviceColorSpace, frameRect(),
+                IntPoint(), IntSize(bg->width(), bg->height()));
+        ctx->drawImage(image.get(), DeviceColorSpace, imageRect.location());
+        ctx->restore();
+    }
+
+    virtual void handleEvent(Event* event)
+    {
+        if (event->type() != eventNames().clickEvent)
+            return;
+
+        WTF::PassRefPtr<PluginView> prpWidget =
+                PluginView::create(m_parent.get(),
+                                   m_size,
+                                   m_element,
+                                   m_url,
+                                   m_paramNames,
+                                   m_paramValues,
+                                   m_mimeType,
+                                   m_loadManually);
+        RefPtr<Widget> myProtector(this);
+        RenderWidget* renderer =
+                static_cast<RenderWidget*>(m_element->renderer());
+        prpWidget->focusPluginElement();
+        renderer->setWidget(prpWidget);
+    }
+
+private:
+    RefPtr<Frame>       m_parent;
+    IntSize             m_size;
+    HTMLPlugInElement*  m_element;
+    KURL                m_url;
+    WTF::Vector<String> m_paramNames;
+    WTF::Vector<String> m_paramValues;
+    String              m_mimeType;
+    bool                m_loadManually;
+};
+
 WTF::PassRefPtr<Widget> FrameLoaderClientAndroid::createPlugin(
         const IntSize& size,
         HTMLPlugInElement* element,
@@ -1008,6 +1096,41 @@ WTF::PassRefPtr<Widget> FrameLoaderClientAndroid::createPlugin(
         const WTF::Vector<String>& values,
         const String& mimeType,
         bool loadManually) {
+    WTF::PassRefPtr<PluginView> prpWidget = 0;
+#ifdef ANDROID_PLUGINS
+    // This is copied from PluginView.cpp. We need to determine if a plugin
+    // will be found before doing some of the work in PluginView.
+    String mimeTypeCopy = mimeType;
+    PluginPackage* plugin =
+            PluginDatabase::installedPlugins()->findPlugin(url, mimeTypeCopy);
+    if (!plugin && PluginDatabase::installedPlugins()->refresh()) {
+        mimeTypeCopy = mimeType;
+        plugin = PluginDatabase::installedPlugins()->findPlugin(url,
+                                                                mimeTypeCopy);
+    }
+    Settings* settings = m_frame->settings();
+    // Do the placeholder if plugins are on-demand and there is a plugin for the
+    // given mime type.
+    if (settings && settings->arePluginsOnDemand() && plugin) {
+        return adoptRef(new PluginToggleWidget(m_frame, size, element, url,
+                    names, values, mimeType, loadManually));
+    }
+    prpWidget = PluginView::create(m_frame,
+                                   size,
+                                   element,
+                                   url,
+                                   names,
+                                   values,
+                                   mimeType,
+                                   loadManually);
+    // Return the plugin if it was loaded successfully. Otherwise, fallback to
+    // the youtube placeholder if possible. No need to check prpWidget as
+    // PluginView::create will create a PluginView for missing plugins.
+    // Note: this check really only checks if the plugin was found and not if
+    // the plugin was loaded.
+    if (prpWidget->status() == PluginStatusLoadedSuccessfully)
+        return prpWidget;
+#endif
     // Create an iframe for youtube urls.
     if (isYouTubeUrl(url, mimeType) && isYouTubeInstalled()) {
         WTF::RefPtr<Frame> frame = createFrame(blankURL(), String(), element,
@@ -1037,20 +1160,8 @@ WTF::PassRefPtr<Widget> FrameLoaderClientAndroid::createPlugin(
             WTF::RefPtr<Widget> widget(frame->view());
             return widget.release();
         }
-        return NULL;
     }
-#ifdef ANDROID_PLUGINS
-    return PluginView::create(m_frame,
-                              size,
-                              element,
-                              url,
-                              names,
-                              values,
-                              mimeType,
-                              loadManually);
-#else
-    return NULL;
-#endif
+    return prpWidget;
 }
 
 void FrameLoaderClientAndroid::redirectDataToPlugin(Widget* pluginWidget) {
diff --git a/WebKit/android/jni/WebSettings.cpp b/WebKit/android/jni/WebSettings.cpp
index 91ed8cc..70ecded 100644
--- a/WebKit/android/jni/WebSettings.cpp
+++ b/WebKit/android/jni/WebSettings.cpp
@@ -83,7 +83,8 @@ struct FieldIds {
         mBlockNetworkImage = env->GetFieldID(clazz, "mBlockNetworkImage", "Z");
 #endif
         mJavaScriptEnabled = env->GetFieldID(clazz, "mJavaScriptEnabled", "Z");
-        mPluginsEnabled = env->GetFieldID(clazz, "mPluginsEnabled", "Z");
+        mPluginState = env->GetFieldID(clazz, "mPluginState",
+                "Landroid/webkit/WebSettings$PluginState;");
 #if ENABLE(DATABASE)
         mDatabaseEnabled = env->GetFieldID(clazz, "mDatabaseEnabled", "Z");
 #endif
@@ -133,7 +134,7 @@ struct FieldIds {
         LOG_ASSERT(mBlockNetworkImage, "Could not find field mBlockNetworkImage");
 #endif
         LOG_ASSERT(mJavaScriptEnabled, "Could not find field mJavaScriptEnabled");
-        LOG_ASSERT(mPluginsEnabled, "Could not find field mPluginsEnabled");
+        LOG_ASSERT(mPluginState, "Could not find field mPluginState");
 #if ENABLE(OFFLINE_WEB_APPLICATIONS)
         LOG_ASSERT(mAppCacheEnabled, "Could not find field mAppCacheEnabled");
         LOG_ASSERT(mAppCachePath, "Could not find field mAppCachePath");
@@ -179,7 +180,7 @@ struct FieldIds {
     jfieldID mBlockNetworkImage;
 #endif
     jfieldID mJavaScriptEnabled;
-    jfieldID mPluginsEnabled;
+    jfieldID mPluginState;
 #if ENABLE(OFFLINE_WEB_APPLICATIONS)
     jfieldID mAppCacheEnabled;
     jfieldID mAppCachePath;
@@ -313,8 +314,15 @@ public:
         flag = env->GetBooleanField(obj, gFieldIds->mJavaScriptEnabled);
         s->setJavaScriptEnabled(flag);
 
-        flag = env->GetBooleanField(obj, gFieldIds->mPluginsEnabled);
-        s->setPluginsEnabled(flag);
+        // ON = 0
+        // ON_DEMAND = 1
+        // OFF = 2
+        jobject pluginState = env->GetObjectField(obj, gFieldIds->mPluginState);
+        int state = env->CallIntMethod(pluginState, gFieldIds->mOrdinal);
+        s->setPluginsEnabled(state < 2);
+#ifdef ANDROID_PLUGINS
+        s->setPluginsOnDemand(state == 1);
+#endif
 
 #if ENABLE(OFFLINE_WEB_APPLICATIONS)
         flag = env->GetBooleanField(obj, gFieldIds->mAppCacheEnabled);
diff --git a/WebKit/android/nav/CacheBuilder.cpp b/WebKit/android/nav/CacheBuilder.cpp
index d1d36df..a3aeede 100644
--- a/WebKit/android/nav/CacheBuilder.cpp
+++ b/WebKit/android/nav/CacheBuilder.cpp
@@ -878,8 +878,7 @@ static Node* OneAfter(Node* node)
 static bool checkForPluginViewThatWantsFocus(RenderObject* renderer) {
     if (renderer->isWidget()) {
         Widget* widget = static_cast<RenderWidget*>(renderer)->widget();
-        if (widget && widget->isPluginView()) {
-            PluginView* pv = static_cast<PluginView*>(widget);
+        if (widget && (widget->isPluginView() || widget->isPluginWidget())) {
             // check if this plugin really wants key events (TODO)
             return true;
         }