gpu: Add support for GLX_EXT_texture_from_pixmap extension.

content/common/gpu/gpu_channel.h

Index: content/common/gpu/gpu_channel.h
diff --git a/content/common/gpu/gpu_channel.h b/content/common/gpu/gpu_channel.h
index 867c4ce8434645856a9c836a780bc7f90e0f9238..fc43820486485e9f82080a0b15f4d1241b3c5131 100644
--- a/content/common/gpu/gpu_channel.h
+++ b/content/common/gpu/gpu_channel.h
@@ -39,6 +39,9 @@ class WaitableEvent;
 
 namespace gpu {
 struct RefCountedCounter;
+namespace gles2 {
+class ImageManager;
+}
 }
 
 #if defined(OS_ANDROID)
@@ -100,6 +103,12 @@ class GpuChannel : public IPC::Listener,
       const GPUCreateCommandBufferConfig& init_params,
       int32* route_id);
 
+  void CreateImage(
+      gfx::PluginWindowHandle window,
+      int32 image_id,
+      gfx::Size* size);
+  void DeleteImage(int32 image_id);
+
   gfx::GLShareGroup* share_group() const { return share_group_.get(); }
 
   GpuCommandBufferStub* LookupCommandBuffer(int32 route_id);
@@ -198,6 +207,7 @@ class GpuChannel : public IPC::Listener,
   scoped_refptr<gfx::GLShareGroup> share_group_;
 
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
+  scoped_refptr<gpu::gles2::ImageManager> image_manager_;
 
 #if defined(ENABLE_GPU)
   typedef IDMap<GpuCommandBufferStub, IDMapOwnPointer> StubMap;