Define cc::RendererCapabilities in its own header, fix up includes

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 840a4fa1cff3a031b766045a25b2a1c9a230d83f..1474e6ec37f0bc7e07b574aa7314c1f9149bed6a 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -31,6 +31,7 @@
 #include "cc/input/top_controls_state.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/output/output_surface.h"
+#include "cc/output/renderer_capabilities.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/surfaces/surface_sequence.h"
@@ -67,24 +68,6 @@ struct RenderingStats;
 struct ScrollAndScaleSet;
 enum class GpuRasterizationStatus;
 
-// Provides information on an Impl's rendering capabilities back to the
-// LayerTreeHost.
-struct CC_EXPORT RendererCapabilities {
-  RendererCapabilities(ResourceFormat best_texture_format,
-                       bool allow_partial_texture_updates,
-                       int max_texture_size,
-                       bool using_shared_memory_resources);
-
-  RendererCapabilities();
-  ~RendererCapabilities();
-
-  // Duplicate any modification to this list to RendererCapabilitiesImpl.
-  ResourceFormat best_texture_format;
-  bool allow_partial_texture_updates;
-  int max_texture_size;
-  bool using_shared_memory_resources;
-};
-
 class CC_EXPORT LayerTreeHost {
  public:
   // The SharedBitmapManager will be used on the compositor thread.