cc: Use highp precision for texture coords if available and needed

cc/resources/resource_provider.h

 // 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.
 
 #ifndef CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <deque>
 #include <set>
 #include <string>
@@ skipping 37 matching lines @@
   typedef base::hash_map<ResourceId, ResourceId> ResourceIdMap;
   enum TextureUsageHint {
     TextureUsageAny,
     TextureUsageFramebuffer,
   };
   enum ResourceType {
     GLTexture = 1,
     Bitmap,
   };
 
-  static scoped_ptr<ResourceProvider> Create(OutputSurface* output_surface);
+  static scoped_ptr<ResourceProvider> Create(OutputSurface* output_surface,
+                                             int highp_threshold_min);
 
   virtual ~ResourceProvider();
 
   WebKit::WebGraphicsContext3D* GraphicsContext3D();
   TextureCopier* texture_copier() const { return texture_copier_.get(); }
   int max_texture_size() const { return max_texture_size_; }
   GLenum best_texture_format() const { return best_texture_format_; }
   unsigned num_resources() const { return resources_.size(); }
 
   // Checks whether a resource is in use by a consumer.
@@ skipping 280 matching lines @@
     ResourceIdMap parent_to_child_map;
   };
   typedef base::hash_map<int, Child> ChildMap;
 
   bool ReadLockFenceHasPassed(Resource* resource) {
     return !resource->read_lock_fence ||
         resource->read_lock_fence->HasPassed();
   }
 
   explicit ResourceProvider(OutputSurface* output_surface);
-  bool Initialize();
+  bool Initialize(int highp_threshold_min);
 
   const Resource* LockForRead(ResourceId id);
   void UnlockForRead(ResourceId id);
   const Resource* LockForWrite(ResourceId id);
   void UnlockForWrite(ResourceId id);
   static void PopulateSkBitmapWithResource(SkBitmap* sk_bitmap,
                                            const Resource* resource);
 
   bool TransferResource(WebKit::WebGraphicsContext3D* context,
                         ResourceId id,
@@ skipping 21 matching lines @@
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<Fence> current_read_lock_fence_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_