Fix race condition introduced in r242200 where AwContentsIoThreadClient is...

Fix race condition introduced in r242200 where AwContentsIoThreadClient is queried before a subframe's entry is added.

This happened because the entry was updated on the UI thread through WebContentsObserver::RenderFrameCreated. The race condition was that the IO thread could dispatch a resource request for that subframe before the map is updated.

The fix is to send a message from the renderer to the IO thread when a subframe is created so that the map is updated before any resouce requests arrive.

BUG=304341
R=mkosiba@chromium.org

Review URL: https://codereview.chromium.org/135443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244521 0039d316-1c4b-4281-b951-d872f2087c98

android_webview/browser/aw_content_browser_client.cc

@@ -7,6 +7,7 @@
 #include "android_webview/browser/aw_browser_context.h"
 #include "android_webview/browser/aw_browser_main_parts.h"
 #include "android_webview/browser/aw_contents_client_bridge_base.h"
+#include "android_webview/browser/aw_contents_io_thread_client.h"
 #include "android_webview/browser/aw_cookie_access_policy.h"
 #include "android_webview/browser/aw_quota_permission_context.h"
 #include "android_webview/browser/aw_web_preferences_populater.h"
@@ -56,6 +57,7 @@ public:
   void OnShouldOverrideUrlLoading(int routing_id,
                                   const base::string16& url,
                                   bool* ignore_navigation);
+  void OnSubFrameCreated(int parent_render_frame_id, int child_render_frame_id);
 
 private:
   virtual ~AwContentsMessageFilter();
@@ -85,6 +87,7 @@ bool AwContentsMessageFilter::OnMessageReceived(const IPC::Message& message,
   IPC_BEGIN_MESSAGE_MAP_EX(AwContentsMessageFilter, message, *message_was_ok)
       IPC_MESSAGE_HANDLER(AwViewHostMsg_ShouldOverrideUrlLoading,
                           OnShouldOverrideUrlLoading)
+      IPC_MESSAGE_HANDLER(AwViewHostMsg_SubFrameCreated, OnSubFrameCreated)
       IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -106,6 +109,12 @@ void AwContentsMessageFilter::OnShouldOverrideUrlLoading(
   }
 }
 
+void AwContentsMessageFilter::OnSubFrameCreated(int parent_render_frame_id,
+                                                int child_render_frame_id) {
+  AwContentsIoThreadClient::SubFrameCreated(
+      process_id_, parent_render_frame_id, child_render_frame_id);
+}
+
 class AwAccessTokenStore : public content::AccessTokenStore {
  public:
   AwAccessTokenStore() { }

android_webview/browser/aw_contents_io_thread_client.h

@@ -62,6 +62,11 @@ class AwContentsIoThreadClient {
   static scoped_ptr<AwContentsIoThreadClient> FromID(int render_process_id,
                                                      int render_frame_id);
 
+  // Called on the IO thread when a subframe is created.
+  static void SubFrameCreated(int render_process_id,
+                              int parent_render_frame_id,
+                              int child_render_frame_id);
+
   // This method is called on the IO thread only.
   virtual scoped_ptr<InterceptedRequestData> ShouldInterceptRequest(
       const GURL& location,

android_webview/common/render_view_messages.h

@@ -110,3 +110,8 @@ IPC_SYNC_MESSAGE_CONTROL2_1(AwViewHostMsg_ShouldOverrideUrlLoading,
                             int /* render_frame_id id */,
                             base::string16 /* in - url */,
                             bool /* out - result */)
+
+// Sent when a subframe is created.
+IPC_MESSAGE_CONTROL2(AwViewHostMsg_SubFrameCreated,
+                     int /* parent_render_frame_id */,
+                     int /* child_render_frame_id */)

android_webview/native/aw_contents_io_thread_client_impl.cc

@@ -165,6 +165,22 @@ AwContentsIoThreadClient::FromID(int render_process_id, int render_frame_id) {
       client_data.pending_association, java_delegate));
 }
 
+// static
+void AwContentsIoThreadClient::SubFrameCreated(int render_process_id,
+                                               int parent_render_frame_id,
+                                               int child_render_frame_id) {
+  pair<int, int> parent_rfh_id(render_process_id, parent_render_frame_id);
+  pair<int, int> child_rfh_id(render_process_id, child_render_frame_id);
+  IoThreadClientData client_data;
+  if (!RfhToIoThreadClientMap::GetInstance()->Get(parent_rfh_id,
+                                                  &client_data)) {
+    NOTREACHED();
+    return;
+  }
+
+  RfhToIoThreadClientMap::GetInstance()->Set(child_rfh_id, client_data);
+}
+
 // static
 void AwContentsIoThreadClientImpl::RegisterPendingContents(
     WebContents* web_contents) {

android_webview/renderer/aw_content_renderer_client.cc

@@ -21,6 +21,7 @@
 #include "content/public/renderer/navigation_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
+#include "content/public/renderer/render_view.h"
 #include "net/base/net_errors.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
@@ -116,6 +117,17 @@ bool AwContentRendererClient::HandleNavigation(
 void AwContentRendererClient::RenderFrameCreated(
     content::RenderFrame* render_frame) {
   new AwPermissionClient(render_frame);
+
+  // TODO(jam): when a RenderFrame is per WebFrame, this can be simplified by
+  // getting a RenderFrame's WebFrame and calling its parent() method.
+  content::RenderFrame* parent_frame =
+      render_frame->GetRenderView()->GetMainRenderFrame();
+  if (parent_frame && parent_frame != render_frame) {
+    // Avoid any race conditions from having the browser's UI thread tell the IO
+    // thread that a subframe was created.
+    RenderThread::Get()->Send(new AwViewHostMsg_SubFrameCreated(
+        parent_frame->GetRoutingID(), render_frame->GetRoutingID()));
+  }
 }
 
 void AwContentRendererClient::RenderViewCreated(