cc: Avoid issuing COMMANDS_COMPLETED queries unless necessary.

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 283 matching lines @@
     ResourceProvider::ResourceId resource_id_;
     SkBitmap sk_bitmap_;
     scoped_ptr<SkCanvas> sk_canvas_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockSoftware);
   };
 
   class Fence : public base::RefCounted<Fence> {
    public:
     Fence() {}
+
+    virtual void Set() = 0;
     virtual bool HasPassed() = 0;
 
    protected:
     friend class base::RefCounted<Fence>;
     virtual ~Fence() {}
 
    private:
     DISALLOW_COPY_AND_ASSIGN(Fence);
   };
 
@@ skipping 35 matching lines @@
   void CreateForTesting(ResourceId id);
 
   GLenum TargetForTesting(ResourceId id);
 
   // Sets the current read fence. If a resource is locked for read
   // and has read fences enabled, the resource will not allow writes
   // until this fence has passed.
   void SetReadLockFence(Fence* fence) { current_read_lock_fence_ = fence; }
 
   // Enable read lock fences for a specific resource.
-  void EnableReadLockFences(ResourceProvider::ResourceId id, bool enable);
+  void EnableReadLockFences(ResourceProvider::ResourceId id);
 
   // Indicates if we can currently lock this resource for write.
   bool CanLockForWrite(ResourceId id);
 
   // Copy pixels from source to destination.
   void CopyResource(ResourceId source_id, ResourceId dest_id);
 
   static GLint GetActiveTextureUnit(gpu::gles2::GLES2Interface* gl);
 
  private:
@@ skipping 41 matching lines @@
     int lock_for_read_count;
     int imported_count;
     int exported_count;
     bool dirty_image : 1;
     bool locked_for_write : 1;
     bool lost : 1;
     bool marked_for_deletion : 1;
     bool pending_set_pixels : 1;
     bool set_pixels_completion_forced : 1;
     bool allocated : 1;
-    bool enable_read_lock_fences : 1;
+    bool read_lock_fences_enabled : 1;
     bool has_shared_bitmap_id : 1;
     bool allow_overlay : 1;
     scoped_refptr<Fence> read_lock_fence;
     gfx::Size size;
     Origin origin;
     GLenum target;
     // TODO(skyostil): Use a separate sampler object for filter state.
     GLenum original_filter;
     GLenum filter;
     unsigned image_id;
@@ skipping 262 matching lines @@
   return format_gl_data_format[format];
 }
 
 inline GLenum GLInternalFormat(ResourceFormat format) {
   return GLDataFormat(format);
 }
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_