cc: Allow output readback/copy requests to specify a sub-rect to copy.

cc/test/solid_color_content_layer_client.h

Index: cc/test/solid_color_content_layer_client.h
diff --git a/cc/test/solid_color_content_layer_client.h b/cc/test/solid_color_content_layer_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..ad7c0f008675acc6154513b78bb5493ea097c8dc
--- /dev/null
+++ b/cc/test/solid_color_content_layer_client.h
@@ -0,0 +1,30 @@
+// Copyright 2013 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_TEST_SOLID_COLOR_CONTENT_LAYER_CLIENT_H_
+#define CC_TEST_SOLID_COLOR_CONTENT_LAYER_CLIENT_H_
+
+#include "base/compiler_specific.h"
+#include "cc/layers/content_layer_client.h"
+#include "third_party/skia/include/core/SkColor.h"
+
+namespace cc {
+
+class SolidColorContentLayerClient : public cc::ContentLayerClient {
+ public:
+  explicit SolidColorContentLayerClient(SkColor color) : color_(color) {}
+
+  // ContentLayerClient implementation.
+  virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
+  virtual void PaintContents(SkCanvas* canvas,
+                             gfx::Rect rect,
+                             gfx::RectF* opaque_rect) OVERRIDE;
+
+ private:
+  SkColor color_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_SOLID_COLOR_CONTENT_LAYER_CLIENT_H_