ozone: gpu: Add plumbing for platform-specific gpu messaging

ui/ozone/platform/dri/ozone_platform_gbm.cc

Index: ui/ozone/platform/dri/ozone_platform_gbm.cc
diff --git a/ui/ozone/platform/dri/ozone_platform_gbm.cc b/ui/ozone/platform/dri/ozone_platform_gbm.cc
index 4e47a289f841630bbcf75ee1ad386f43242a6368..0dff77200aa8c9eb5fd4921abe66268920530c90 100644
--- a/ui/ozone/platform/dri/ozone_platform_gbm.cc
+++ b/ui/ozone/platform/dri/ozone_platform_gbm.cc
@@ -99,6 +99,8 @@ class OzonePlatformGbm : public OzonePlatform {
     cursor_factory_ozone_.reset(new CursorFactoryOzone());
     event_factory_ozone_.reset(new EventFactoryEvdev(
         NULL, device_manager_.get()));
+
+    gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
   virtual void InitializeGPU() OVERRIDE {
@@ -110,6 +112,8 @@ class OzonePlatformGbm : public OzonePlatform {
         new GbmSurfaceFactory(dri_.get(),
                               surface_generator_->device(),
                               screen_manager_.get()));
+
+    gpu_platform_support_.reset(CreateStubGpuPlatformSupport());
   }
 
  private:
@@ -123,6 +127,9 @@ class OzonePlatformGbm : public OzonePlatform {
   scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
   scoped_ptr<EventFactoryEvdev> event_factory_ozone_;
 
+  scoped_ptr<GpuPlatformSupport> gpu_platform_support_;
+  scoped_ptr<GpuPlatformSupportHost> gpu_platform_support_host_;
+
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformGbm);
 };