Add GL_EXT_color_buffer_half_float support

cc/resources/resource_provider.cc

 // Copyright 2012 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.
 
 #include "cc/resources/resource_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 529 matching lines @@
     case ETC1:
       return caps.texture_format_etc1;
     case RED_8:
       return caps.texture_rg;
     case LUMINANCE_F16:
       return caps.texture_half_float_linear;
     case RGBA_F16:
       // TODO(ccameron): This will always return false on pixel tests, which
       // makes it un-test-able until we upgrade Mesa.
       // https://crbug.com/687720
-      return caps.texture_half_float_linear && caps.color_buffer_float;
+      return caps.texture_half_float_linear &&
+             caps.color_buffer_half_float_rgba;
   }
 
   NOTREACHED();
   return false;
 }
 
 bool ResourceProvider::InUseByConsumer(ResourceId id) {
   Resource* resource = GetResource(id);
   return resource->lock_for_read_count > 0 || resource->exported_count > 0 ||
          resource->lost;
@@ skipping 1611 matching lines @@
 
     const int kImportance = 2;
     pmd->CreateSharedGlobalAllocatorDump(guid);
     pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
   }
 
   return true;
 }
 
 }  // namespace cc