[Android WebView] Implement the capture picture API.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 984 matching lines @@
     dib->second->Detach();
 #else
   STLDeleteContainerPairSecondPointers(
       cached_dibs_.begin(), cached_dibs_.end());
 #endif
   cached_dibs_.clear();
 }
 
 bool RenderProcessHostImpl::Send(IPC::Message* msg) {
   if (!channel_.get()) {
-    if (!is_initialized_) {
+    if (!is_initialized_ && !msg->is_sync()) {
       queued_messages_.push(msg);
       return true;
     } else {
       delete msg;
       return false;
     }
   }
 
   if (child_process_launcher_.get() && child_process_launcher_->IsStarting()) {
+    if (msg->is_sync()) {
+      delete msg;
+      return false;
+    }
     queued_messages_.push(msg);
     return true;
   }
 
   return channel_->Send(msg);
 }
 
 bool RenderProcessHostImpl::OnMessageReceived(const IPC::Message& msg) {
   // If we're about to be deleted, or have initiated the fast shutdown sequence,
   // we ignore incoming messages.
@@ skipping 588 matching lines @@
   TRACE_EVENT0("renderer_host",
                "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwappedNoHost");
   AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
   ack_params.sync_point = 0;
   RenderWidgetHostImpl::AcknowledgeBufferPresent(route_id,
                                                  gpu_process_host_id,
                                                  ack_params);
 }
 
 }  // namespace content