content: Add multi-proc surface texture support.

content/common/gpu/client/gpu_channel_host.h

Index: content/common/gpu/client/gpu_channel_host.h
diff --git a/content/common/gpu/client/gpu_channel_host.h b/content/common/gpu/client/gpu_channel_host.h
index e073db004d4d056ec4620eb2943912369ff12bc5..cf0492a428705d3af64498913b1a93bd91318d67 100644
--- a/content/common/gpu/client/gpu_channel_host.h
+++ b/content/common/gpu/client/gpu_channel_host.h
@@ -58,6 +58,7 @@ struct GpuListenerInfo {
 class CONTENT_EXPORT GpuChannelHostFactory {
  public:
   typedef base::Callback<void(const gfx::Size)> CreateImageCallback;
+  typedef base::Closure CreateSurfaceTextureCallback;
 
   virtual ~GpuChannelHostFactory() {}
 
@@ -76,6 +77,10 @@ class CONTENT_EXPORT GpuChannelHostFactory {
       size_t width,
       size_t height,
       unsigned internalformat) = 0;
+  virtual void CreateSurfaceTexture(
+      int32 surface_texture_id,
+      int32 process_handle,
+      const CreateSurfaceTextureCallback& callback) = 0;
 };
 
 // Encapsulates an IPC channel between the client and one GPU process.