gpu: Add support for GLX_EXT_texture_from_pixmap extension.

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 2d10724ec1647f8eaa8c2797210827685cd9a62a..ba42f452b0ebc2fa9c923c4ded1177d937398345 100644
--- a/content/common/gpu/client/gpu_channel_host.h
+++ b/content/common/gpu/client/gpu_channel_host.h
@@ -56,6 +56,8 @@ struct GpuListenerInfo {
 
 class CONTENT_EXPORT GpuChannelHostFactory {
  public:
+  typedef base::Callback<void(const gfx::Size)> CreateImageCallback;
+
   virtual ~GpuChannelHostFactory() {}
 
   virtual bool IsMainThread() = 0;
@@ -68,6 +70,11 @@ class CONTENT_EXPORT GpuChannelHostFactory {
       int32 surface_id, const GPUCreateCommandBufferConfig& init_params) = 0;
   virtual GpuChannelHost* EstablishGpuChannelSync(
       content::CauseForGpuLaunch) = 0;
+  virtual void CreateImage(
+      gfx::PluginWindowHandle window,
+      int32 image_id,
+      const CreateImageCallback& callback) = 0;
+  virtual void DeleteImage(int32 image_id) = 0;
 };
 
 // Encapsulates an IPC channel between the client and one GPU process.