aura: Add Layer::LAYER_SOLID_COLOR to compositor.

ui/gfx/compositor/layer.h

 // Copyright (c) 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 UI_GFX_COMPOSITOR_LAYER_H_
 #define UI_GFX_COMPOSITOR_LAYER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
+#include "third_party/skia/include/core/SkColor.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebContentLayerClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebLayer.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 #include "ui/gfx/compositor/compositor.h"
 #include "ui/gfx/compositor/layer_animation_delegate.h"
 #include "ui/gfx/compositor/layer_delegate.h"
 
 class SkCanvas;
 
 namespace ui {
 
 class Compositor;
 class LayerAnimator;
 class Texture;
 
 // Layer manages a texture, transform and a set of child Layers. Any View that
 // has enabled layers ends up creating a Layer to manage the texture.
 // A Layer can also be created without a texture, in which case it renders
 // nothing and is simply used as a node in a hierarchy of layers.
 //
 // NOTE: unlike Views, each Layer does *not* own its children views. If you
 // delete a Layer and it has children, the parent of each child layer is set to
 // NULL, but the children are not deleted.
 class COMPOSITOR_EXPORT Layer :
     public LayerAnimationDelegate,
     NON_EXPORTED_BASE(public WebKit::WebContentLayerClient) {
  public:
   enum LayerType {
-    LAYER_HAS_NO_TEXTURE = 0,
-    LAYER_HAS_TEXTURE = 1
+    // A layer that is never drawn onscreen.
+    LAYER_NOT_DRAWN = 0,
+
+    // A layer that has a texture.
+    LAYER_TEXTURED = 1,
+
+    // A layer that's drawn as a single color.
+    LAYER_SOLID_COLOR = 2,
   };
 
   Layer();
   explicit Layer(LayerType type);
   virtual ~Layer();
 
   // Retrieves the Layer's compositor. The Layer will walk up its parent chain
   // to locate it. Returns NULL if the Layer is not attached to a compositor.
   Compositor* GetCompositor();
 
@@ skipping 105 matching lines @@
   void set_name(const std::string& name) { name_ = name; }
 
   const ui::Texture* texture() const { return texture_.get(); }
 
   // Assigns a new external texture.  |texture| can be NULL to disable external
   // updates.
   // TODO(beng): This can be removed from the API when we are in a
   //             single-compositor world.
   void SetExternalTexture(ui::Texture* texture);
 
-  // Resets the canvas of the texture.
+  // Resets the canvas of the texture.  May only be called for LAYER_TEXTURED.
   void SetCanvas(const SkCanvas& canvas, const gfx::Point& origin);
 
+  // Sets the layer's fill color.  May only be called for LAYER_SOLID_COLOR.
+  void SetColor(SkColor color);
+
   // Adds |invalid_rect| to the Layer's pending invalid rect and calls
   // ScheduleDraw().
   void SchedulePaint(const gfx::Rect& invalid_rect);
 
   // Schedules a redraw of the layer tree at the compositor.
   void ScheduleDraw();
 
   // Does drawing for the layer.
   void Draw();
 
@@ skipping 160 matching lines @@
   bool web_layer_is_accelerated_;
   bool show_debug_borders_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_LAYER_H_