Adds the ability for the renderer to create the mojo channel

content/renderer/render_thread_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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 128 matching lines @@
 #else
 // TODO(port)
 #include "base/memory/scoped_handle.h"
 #include "content/child/npapi/np_channel_base.h"
 #endif
 
 #if defined(ENABLE_PLUGINS)
 #include "content/renderer/npapi/plugin_channel_host.h"
 #endif
 
+// TODO(sky): remove ifdef, temporary until mac/android sorted out.
+#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
+#include "content/renderer/mojo_message_filter.h"
+#endif
+
 using base::ThreadRestrictions;
 using blink::WebDocument;
 using blink::WebFrame;
 using blink::WebNetworkStateNotifier;
 using blink::WebRuntimeFeatures;
 using blink::WebScriptController;
 using blink::WebSecurityPolicy;
 using blink::WebString;
 using blink::WebView;
 
@@ skipping 220 matching lines @@
   audio_message_filter_ = new AudioMessageFilter(GetIOMessageLoopProxy());
   AddFilter(audio_message_filter_.get());
 
   midi_message_filter_ = new MidiMessageFilter(GetIOMessageLoopProxy());
   AddFilter(midi_message_filter_.get());
 
   AddFilter((new IndexedDBMessageFilter(thread_safe_sender()))->GetFilter());
 
   AddFilter((new EmbeddedWorkerContextMessageFilter())->GetFilter());
 
+// TODO(sky): remove ifdef, temporary until mac/android sorted out.
+#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
+  // MojoMessageFilter deletes itself as necessary.

[Tom Sepez, 2014/03/13 23:05:36]

nit: can we avoid this pattern and use AddFilter instead?  It looks wrong
despite the comment. 

[sky, 2014/03/13 23:10:50]

I actually did this first, then pulled out my hair trying to figure out why
MojoMessageFilter wasn't getting the message. Turns out this happens because the
message is a control message (it isn't associated with a particular view) and
control messages don't go to the filters.

MojoMessageFilter is a bit confusingly named since it's a
RenderProcessHostObserver and not a filter, but I couldn't think of a better
name.

+  new MojoMessageFilter(this);
+#endif
+
   GetContentClient()->renderer()->RenderThreadStarted();
 
   InitSkiaEventTracer();
 
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(cc::switches::kEnableGpuBenchmarking))
       RegisterExtension(GpuBenchmarkingExtension::Get());
 
   is_impl_side_painting_enabled_ =
       command_line.HasSwitch(switches::kEnableImplSidePainting) &&
@@ skipping 1069 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content