Prohibit scrolling not initiated by the user.

We used to have an ANDROID specific change that was removed when
webkit changed.  See https://android-git.corp.google.com/w/?p=platform/external/webkit.git;a=commitdiff;h=57a47dd4f75b9c15804c3c61479540cfdc11bd6e

Bug 1330729
Bug 2694223

Change-Id: Id51edbb4943eb0a1357477d4bcd31d838febb8fb

1 files changed, 13 insertions, 0 deletions

diff --git a/WebKit/android/WebCoreSupport/PlatformBridge.cpp b/WebKit/android/WebCoreSupport/PlatformBridge.cpp
index 05aa42b..13bbf38 100644
--- a/WebKit/android/WebCoreSupport/PlatformBridge.cpp
+++ b/WebKit/android/WebCoreSupport/PlatformBridge.cpp
@@ -27,9 +27,11 @@
 #include <PlatformBridge.h>
 
 #include "CookieClient.h"
+#include "FrameView.h"
 #include "JavaSharedClient.h"
 #include "KeyGeneratorClient.h"
 #include "PluginView.h"
+#include "WebCoreFrameBridge.h"
 #include "WebViewCore.h"
 #include "npruntime.h"
 #include <wtf/android/AndroidThreading.h>
@@ -135,6 +137,17 @@ bool PlatformBridge::isWebViewPaused(const WebCore::FrameView* frameView)
     return webViewCore->isPaused();
 }
 
+bool PlatformBridge::canScroll(const WebCore::FrameView* frameView)
+{
+    // We want to ignore requests to scroll that were not initiated by the
+    // user.  An example of this is when text is inserted into a
+    // textfield/area, which results in a scroll.  We ignore this because
+    // we know how to do this ourselves in the UI thread.
+    // An example of it being initiated by the user is if the user clicks
+    // an anchor element which simply scrolls the page.
+    return android::WebFrame::getWebFrame(frameView->frame())->userInitiatedClick();
+}
+
 bool PlatformBridge::popupsAllowed(NPP)
 {
     return false;