Calling OpenGL from the renderer process

- Added ability for renderer processes to render to a real window (Windows only so far).
- Added ability to create offscreen frame buffer objects that can be resized later.
- OpenGL context can have a "parent" context that can access its last swapped back buffer through a texture ID.
- Moved code to establish GPU channel from RenderWidget to RenderThread.
- Changed way service size command buffer object lifetimes are managed.
TEST=trybot and visual verification that OpenGL can clear the browser window to magenta.
BUG=none

Review URL: http://codereview.chromium.org/1136006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42679 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 16 insertions, 0 deletions

diff --git a/chrome/renderer/render_thread.h b/chrome/renderer/render_thread.h
index fea7e41..3caed00 100644
--- a/chrome/renderer/render_thread.h
+++ b/chrome/renderer/render_thread.h
@@ -18,9 +18,11 @@
 #include "chrome/common/child_thread.h"
 #include "chrome/common/css_colors.h"
 #include "chrome/common/dom_storage_common.h"
+#include "chrome/renderer/gpu_channel_host.h"
 #include "chrome/renderer/renderer_histogram_snapshots.h"
 #include "chrome/renderer/visitedlink_slave.h"
 #include "gfx/native_widget_types.h"
+#include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_platform_file.h"
 
 class AppCacheDispatcher;
@@ -165,6 +167,15 @@ class RenderThread : public RenderThreadBase,
   // Update the list of active extensions that will be reported when we crash.
   void UpdateActiveExtensions();
 
+  // Asynchronously establish a channel to the GPU plugin if not previously
+  // established or if it has been lost (for example if the GPU plugin crashed).
+  // Use GetGpuChannel() to determine when the channel is ready for use.
+  void EstablishGpuChannel();
+
+  // Get the GPU channel. Returns NULL if the channel is not established or
+  // has been lost.
+  GpuChannelHost* GetGpuChannel();
+
  private:
   virtual void OnControlMessageReceived(const IPC::Message& msg);
 
@@ -220,6 +231,8 @@ class RenderThread : public RenderThreadBase,
   void OnSpellCheckWordAdded(const std::string& word);
   void OnSpellCheckEnableAutoSpellCorrect(bool enable);
 
+  void OnGpuChannelEstablished(const IPC::ChannelHandle& channel_handle);
+
   // Gather usage statistics from the in-memory cache and inform our host.
   // These functions should be call periodically so that the host can make
   // decisions about how to allocation resources using current information.
@@ -288,6 +301,9 @@ class RenderThread : public RenderThreadBase,
   // not idle, to ensure that IdleHandle gets called eventually.
   base::RepeatingTimer<RenderThread> forced_idle_timer_;
 
+  // The channel from the renderer process to the GPU process.
+  scoped_refptr<GpuChannelHost> gpu_channel_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderThread);
 };