cc: Adding support for RGBA_4444 tile textures

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index e362f84b4ca09789afc7c0ea734edab6f5039e9a..51d53442b5820aa752c64a683cbc85a7916415c9 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -24,6 +24,7 @@
 #include "cc/input/top_controls_state.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/output/output_surface.h"
+#include "cc/resources/resource_provider.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/resources/ui_resource_client.h"
@@ -61,7 +62,6 @@ class PrioritizedResourceManager;
 class PrioritizedResource;
 class Region;
 class RenderingStatsInstrumentation;
-class ResourceProvider;
 class ResourceUpdateQueue;
 class TopControlsManager;
 struct RenderingStats;
@@ -73,7 +73,7 @@ struct CC_EXPORT RendererCapabilities {
   RendererCapabilities();
   ~RendererCapabilities();
 
-  unsigned best_texture_format;
+  ResourceProvider::Format best_texture_format;
   bool using_partial_swap;
   bool using_set_visibility;
   bool using_egl_image;