Modified the structure ContextProvider::Capabilities to use bitfields.

cc/output/context_provider.h

Index: cc/output/context_provider.h
===================================================================
--- cc/output/context_provider.h	(revision 237046)
+++ cc/output/context_provider.h	(working copy)
@@ -29,22 +29,22 @@
   virtual class GrContext* GrContext() = 0;
 
   struct Capabilities {
-    bool discard_backbuffer;
-    bool egl_image_external;
-    bool fast_npot_mo8_textures;
-    bool iosurface;
-    bool map_image;
-    bool map_sub;
-    bool post_sub_buffer;
-    bool set_visibility;
-    bool shallow_flush;
-    bool swapbuffers_complete_callback;
-    bool texture_format_bgra8888;
-    bool texture_format_etc1;
-    bool texture_rectangle;
-    bool texture_storage;
-    bool texture_usage;
-    bool discard_framebuffer;
+    bool discard_backbuffer : 1;
+    bool egl_image_external : 1;
+    bool fast_npot_mo8_textures : 1;
+    bool iosurface : 1;
+    bool map_image : 1;
+    bool map_sub : 1;
+    bool post_sub_buffer : 1;
+    bool set_visibility : 1;
+    bool shallow_flush : 1;
+    bool swapbuffers_complete_callback : 1;
+    bool texture_format_bgra8888 : 1;
+    bool texture_format_etc1 : 1;
+    bool texture_rectangle : 1;
+    bool texture_storage : 1;
+    bool texture_usage : 1;
+    bool discard_framebuffer : 1;
     size_t max_transfer_buffer_usage_bytes;
 
     CC_EXPORT Capabilities();