Introduce ChannelMojo

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 120 matching lines @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/process_type.h"
 #include "content/public/common/resource_type.h"
 #include "content/public/common/result_codes.h"
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
 #include "content/public/common/url_constants.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_switches.h"
+#include "ipc/mojo/ipc_channel_mojo.h"
 #include "media/base/media_switches.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "ppapi/shared_impl/ppapi_switches.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/events/event_switches.h"
 #include "ui/gfx/switches.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/native_theme/native_theme_switches.h"
 #include "webkit/browser/fileapi/sandbox_file_system_backend.h"
@@ skipping 406 matching lines @@
 
 #if defined(OS_ANDROID)
   CompositorImpl::DestroyAllSurfaceTextures(GetID());
 #endif
 }
 
 void RenderProcessHostImpl::EnableSendQueue() {
   is_initialized_ = false;
 }
 
+bool RenderProcessHostImpl::IsMojoChannelEnabled() const {

[darin (slow to review), 2014/07/23 23:03:32]

nit: these functions should be listed after MaybeActivateMojo to preserve order
of methods as they appear in the header file.

nit: perhaps this method should be renamed to ShouldUseMojoChannel? this
function returns true before the mojo channel has actually been enabled. it
seems you could also inline this into CreateChannelProxy.

[Hajime Morrita, 2014/07/24 00:38:44]

Done.

+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  return command_line.HasSwitch(switches::kEnableRendererMojoChannel);
+}
+
+scoped_ptr<IPC::ChannelProxy> RenderProcessHostImpl::CreateChannelProxy(
+    const std::string& channel_id) {
+  scoped_refptr<base::SingleThreadTaskRunner> runner =
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO);
+  if (IsMojoChannelEnabled()) {
+    VLOG(1) << "Mojo Channel is enabled on host";
+    return IPC::ChannelProxy::Create(
+        IPC::ChannelMojo::CreateFactory(
+            channel_id, IPC::Channel::MODE_SERVER, runner),
+        this, runner.get());
+  }
+
+  return IPC::ChannelProxy::Create(
+      channel_id, IPC::Channel::MODE_SERVER, this, runner.get());
+}
+
 bool RenderProcessHostImpl::Init() {
   // calling Init() more than once does nothing, this makes it more convenient
   // for the view host which may not be sure in some cases
   if (channel_)
     return true;
 
   CommandLine::StringType renderer_prefix;
 #if defined(OS_POSIX)
   // A command prefix is something prepended to the command line of the spawned
   // process. It is supported only on POSIX systems.
@@ skipping 11 matching lines @@
 
   // Find the renderer before creating the channel so if this fails early we
   // return without creating the channel.
   base::FilePath renderer_path = ChildProcessHost::GetChildPath(flags);
   if (renderer_path.empty())
     return false;
 
   // Setup the IPC channel.
   const std::string channel_id =
       IPC::Channel::GenerateVerifiedChannelID(std::string());
-  channel_ = IPC::ChannelProxy::Create(
-      channel_id,
-      IPC::Channel::MODE_SERVER,
-      this,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get());
+  channel_ = CreateChannelProxy(channel_id);
 
   // Setup the Mojo channel.
   mojo_application_host_->Init();
 
   // Call the embedder first so that their IPC filters have priority.
   GetContentClient()->browser()->RenderProcessWillLaunch(this);
 
   CreateMessageFilters();
 
   if (run_renderer_in_process()) {
@@ skipping 525 matching lines @@
     switches::kEnableLayerSquashing,
     switches::kEnableLogging,
     switches::kEnableMemoryBenchmarking,
     switches::kEnableOneCopy,
     switches::kEnableOverlayFullscreenVideo,
     switches::kEnableOverlayScrollbar,
     switches::kEnableOverscrollNotifications,
     switches::kEnablePinch,
     switches::kEnablePreciseMemoryInfo,
     switches::kEnablePreparsedJsCaching,
+    switches::kEnableRendererMojoChannel,
     switches::kEnableSeccompFilterSandbox,
     switches::kEnableSkiaBenchmarking,
     switches::kEnableSmoothScrolling,
     switches::kEnableSpeechSynthesis,
     switches::kEnableStatsTable,
     switches::kEnableStrictSiteIsolation,
     switches::kEnableTargetedStyleRecalc,
     switches::kEnableThreadedCompositing,
     switches::kEnableTouchDragDrop,
     switches::kEnableTouchEditing,
@@ skipping 1175 matching lines @@
 void RenderProcessHostImpl::GpuMemoryBufferAllocated(
     IPC::Message* reply,
     const gfx::GpuMemoryBufferHandle& handle) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer::WriteReplyParams(reply,
                                                                     handle);
   Send(reply);
 }
 
 }  // namespace content