Modified the structure ContextProvider::Capabilities to use bitfields.

cc/output/context_provider.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_CONTEXT_PROVIDER_H_
 #define CC_OUTPUT_CONTEXT_PROVIDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
@@ skipping 11 matching lines @@
   // accessing the contexts. Calling it more than once should have no effect.
   // Once this function has been called, the class should only be accessed
   // from the same thread.
   virtual bool BindToCurrentThread() = 0;
 
   virtual blink::WebGraphicsContext3D* Context3d() = 0;
   virtual gpu::ContextSupport* ContextSupport() = 0;
   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();
   };
   // Returns the capabilities of the currently bound 3d context.
   virtual Capabilities ContextCapabilities() = 0;
 
   // Checks if the context is currently known to be lost.
   virtual bool IsContextLost() = 0;
 
@@ skipping 28 matching lines @@
       const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<ContextProvider>;
   virtual ~ContextProvider() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_