Fixes a bug when the framebuffer is cleared with invalid scissor rect

cc/test/render_pass_test_utils.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_TEST_RENDER_PASS_TEST_UTILS_H_
 #define CC_TEST_RENDER_PASS_TEST_UTILS_H_
 
 #include "cc/render_pass.h"
 #include "cc/scoped_ptr_vector.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 14 matching lines @@
     RenderPassList& passList,
     RenderPass::Id id,
     const gfx::Rect& outputRect,
     const gfx::Transform& rootTransform);
 
 // Adds a solid quad to a given render pass.
 SolidColorDrawQuad* addQuad(TestRenderPass* pass,
                             const gfx::Rect& rect,
                             SkColor color);
 
+// Adds a solid quad to a given render pass and sets is_clipped=true.
+SolidColorDrawQuad* addClippedQuad(TestRenderPass* pass,
+                                   const gfx::Rect& rect,
+                                   SkColor color);
+
 // Adds a render pass quad to an existing render pass.
 void addRenderPassQuad(TestRenderPass* toPass,
                        TestRenderPass* contributingPass);
 
 }  // namespace cc
 
 #endif  // CC_TEST_RENDER_PASS_TEST_UTILS_H_