cc: Partial draw without partial swap support.

cc/output/direct_renderer.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_OUTPUT_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
@@ skipping 164 matching lines @@
   gfx::Size surface_size_for_swap_buffers() const {
     return reshape_surface_size_;
   }
 
   const RendererSettings* const settings_;
   OutputSurface* const output_surface_;
   ResourceProvider* const resource_provider_;
   // This can be replaced by test implementations.
   std::unique_ptr<OverlayProcessor> overlay_processor_;
 
+  // Whether it's valid to draw with the current damage rect. Trivially
+  // true when using partial swap.
+  bool allow_partial_draw_ = false;
   // Whether it's valid to SwapBuffers with an empty rect. Trivially true when
   // using partial swap.
   bool allow_empty_swap_ = false;
-  // Whether partial swap can be used.
+  // Whether partial swap is used.
   bool use_partial_swap_ = false;
   // Whether overdraw feedback is enabled and can be used.
   bool overdraw_feedback_ = false;
   // Whether the SetDrawRectangle and EnableDCLayers commands are in
   // use.
   bool supports_dc_layers_ = false;
   // Whether the output surface is actually using DirectComposition.
   bool using_dc_layers_ = false;
   // This counts the number of draws since the last time
   // DirectComposition layers needed to be used.
@@ skipping 50 matching lines @@
   gfx::ColorSpace reshape_device_color_space_;
   bool reshape_has_alpha_ = false;
   bool reshape_use_stencil_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_