Implement on demand quad rasterization for PicturePiles.

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 83 matching lines @@
                              GLenum texture_pool,
                              TextureUsageHint hint);
 
   ResourceId CreateBitmap(gfx::Size size);
   // Wraps an external texture into a GL resource.
   ResourceId CreateResourceFromExternalTexture(unsigned texture_id);
 
   // Wraps an external texture mailbox into a GL resource.
   ResourceId CreateResourceFromTextureMailbox(const TextureMailbox& mailbox);
 
+  // Resizes an existing resource. Reallocation is deferred until required.
+  void ResizeResource(ResourceId id, gfx::Size size);
+
   void DeleteResource(ResourceId id);
 
   // Update pixels from image, copying source_rect (in image) to dest_offset (in
   // the resource).
   void SetPixels(ResourceId id,
                  const uint8_t* image,
                  gfx::Rect image_rect,
                  gfx::Rect source_rect,
                  gfx::Vector2d dest_offset);
 
@@ skipping 277 matching lines @@
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<Fence> current_read_lock_fence_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_