cc: Reduce command buffer flushes related to creating texture ids.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 23f1414fa0d6d921c23ca2b4555e00f0296f12fb..d1ed64a661d947b2494a1507fa60d6e51a2038f3 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -65,7 +65,8 @@ class CC_EXPORT ResourceProvider {
       OutputSurface* output_surface,
       SharedBitmapManager* shared_bitmap_manager,
       int highp_threshold_min,
-      bool use_rgba_4444_texture_format);
+      bool use_rgba_4444_texture_format,
+      size_t texture_id_allocation_chunk_size);
   virtual ~ResourceProvider();
 
   void InitializeSoftware();
@@ -432,7 +433,8 @@ class CC_EXPORT ResourceProvider {
   ResourceProvider(OutputSurface* output_surface,
                    SharedBitmapManager* shared_bitmap_manager,
                    int highp_threshold_min,
-                   bool use_rgba_4444_texture_format);
+                   bool use_rgba_4444_texture_format,
+                   size_t texture_id_allocation_chunk_size);
 
   void CleanUpGLIfNeeded();
 
@@ -469,6 +471,8 @@ class CC_EXPORT ResourceProvider {
   // Returns NULL if the output_surface_ does not have a ContextProvider.
   WebKit::WebGraphicsContext3D* Context3d() const;
 
+  unsigned NextTextureId();
+
   OutputSurface* output_surface_;
   SharedBitmapManager* shared_bitmap_manager_;
   bool lost_output_surface_;
@@ -492,6 +496,9 @@ class CC_EXPORT ResourceProvider {
   scoped_refptr<Fence> current_read_lock_fence_;
   bool use_rgba_4444_texture_format_;
 
+  size_t texture_id_allocation_chunk_size_;
+  std::deque<unsigned> unused_texture_ids_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };