Report a load error when network loads blocked. Do not merge

Cherry pick from master.

When network loads are blocked, we should fail those
loads rather than leaving them dangling. In particular,
this fixes an issue where WebCore will wait to do the
first layout while CSS loads are pending. If network
loads are blocked, we need to tell WebCore they are never
going to complete.

To implement this, we make use of the Chromium stack's
load flags and move the code to a more suitable location.

Bug: 5416543
Change-Id: I4bd9987611364b29d3ccaa50437d418a5eb9a5cd

4 files changed, 26 insertions, 19 deletions

diff --git a/Source/WebKit/android/WebCoreSupport/WebResourceRequest.cpp b/Source/WebKit/android/WebCoreSupport/WebResourceRequest.cpp
index 2ede1ca..663ded8 100644
--- a/Source/WebKit/android/WebCoreSupport/WebResourceRequest.cpp
+++ b/Source/WebKit/android/WebCoreSupport/WebResourceRequest.cpp
@@ -34,22 +34,33 @@ using namespace WebCore;
 
 namespace android {
 
-WebResourceRequest::WebResourceRequest(const WebCore::ResourceRequest& resourceRequest)
+WebResourceRequest::WebResourceRequest(const WebCore::ResourceRequest& resourceRequest, bool shouldBlockNetworkLoads)
 {
     // Set the load flags based on the WebCore request.
     m_loadFlags = net::LOAD_NORMAL;
-    switch (resourceRequest.cachePolicy()) {
-    case ReloadIgnoringCacheData:
-        m_loadFlags |= net::LOAD_VALIDATE_CACHE;
-        break;
-    case ReturnCacheDataElseLoad:
-        m_loadFlags |= net::LOAD_PREFERRING_CACHE;
-        break;
-    case ReturnCacheDataDontLoad:
+
+    if (shouldBlockNetworkLoads) {
+        // In the case that the embedder has blocked network loads, we only
+        // ever try to serve content out of the cache. If WebCore has set
+        // ReloadIgnoringCacheData, we would normally attempt to validate
+        // the cached data before serving it. In the absence of network
+        // we can't do that, so we will just return whatever we have in the
+        // cache (which may well be nothing).
         m_loadFlags |= net::LOAD_ONLY_FROM_CACHE;
-        break;
-    case UseProtocolCachePolicy:
-        break;
+    } else {
+        switch (resourceRequest.cachePolicy()) {
+        case ReloadIgnoringCacheData:
+            m_loadFlags |= net::LOAD_VALIDATE_CACHE;
+            break;
+        case ReturnCacheDataElseLoad:
+            m_loadFlags |= net::LOAD_PREFERRING_CACHE;
+            break;
+        case ReturnCacheDataDontLoad:
+            m_loadFlags |= net::LOAD_ONLY_FROM_CACHE;
+            break;
+        case UseProtocolCachePolicy:
+            break;
+        }
     }
 
     // TODO: We should consider setting these flags and net::LOAD_DO_NOT_SEND_AUTH_DATA
diff --git a/Source/WebKit/android/WebCoreSupport/WebResourceRequest.h b/Source/WebKit/android/WebCoreSupport/WebResourceRequest.h
index 38f37b5..7911f02 100644
--- a/Source/WebKit/android/WebCoreSupport/WebResourceRequest.h
+++ b/Source/WebKit/android/WebCoreSupport/WebResourceRequest.h
@@ -39,7 +39,7 @@ namespace android {
 class WebResourceRequest {
 
 public:
-    WebResourceRequest(const WebCore::ResourceRequest&);
+    WebResourceRequest(const WebCore::ResourceRequest&, bool shouldBlockNetworkLoads);
 
     const std::string& method() const
     {
diff --git a/Source/WebKit/android/WebCoreSupport/WebUrlLoader.cpp b/Source/WebKit/android/WebCoreSupport/WebUrlLoader.cpp
index 0c90bc5..f81fa34 100644
--- a/Source/WebKit/android/WebCoreSupport/WebUrlLoader.cpp
+++ b/Source/WebKit/android/WebCoreSupport/WebUrlLoader.cpp
@@ -50,11 +50,6 @@ PassRefPtr<WebUrlLoader> WebUrlLoader::start(FrameLoaderClient* client, WebCore:
     FrameLoaderClientAndroid* androidClient = static_cast<FrameLoaderClientAndroid*>(client);
     WebFrame* webFrame = androidClient->webFrame();
 
-    if (webFrame->blockNetworkLoads() &&
-        (resourceRequest.url().protocolIs("http") ||
-         resourceRequest.url().protocolIs("https")))
-        return NULL;
-
     webFrame->maybeSavePassword(androidClient->getFrame(), resourceRequest);
 
     RefPtr<WebUrlLoader> loader = WebUrlLoader::create(webFrame, resourceHandle, resourceRequest);
diff --git a/Source/WebKit/android/WebCoreSupport/WebUrlLoaderClient.cpp b/Source/WebKit/android/WebCoreSupport/WebUrlLoaderClient.cpp
index 56a9539..a6e58c8 100644
--- a/Source/WebKit/android/WebCoreSupport/WebUrlLoaderClient.cpp
+++ b/Source/WebKit/android/WebCoreSupport/WebUrlLoaderClient.cpp
@@ -110,7 +110,8 @@ WebUrlLoaderClient::WebUrlLoaderClient(WebFrame* webFrame, WebCore::ResourceHand
     , m_sync(false)
     , m_finished(false)
 {
-    WebResourceRequest webResourceRequest(resourceRequest);
+    bool block = webFrame->blockNetworkLoads() && (resourceRequest.url().protocolIs("http") || resourceRequest.url().protocolIs("https"));
+    WebResourceRequest webResourceRequest(resourceRequest, block);
     UrlInterceptResponse* intercept = webFrame->shouldInterceptRequest(resourceRequest.url().string());
     if (intercept) {
         m_request = new WebRequest(this, webResourceRequest, intercept);