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

cc/test/render_pass_test_utils.cc

 // 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.
 
 #include "cc/test/render_pass_test_utils.h"
 
 #include "cc/append_quads_data.h"
 #include "cc/quad_sink.h"
 #include "cc/render_pass_draw_quad.h"
 #include "cc/shared_quad_state.h"
@@ skipping 23 matching lines @@
   SharedQuadState* sharedState =
       quadSink.useSharedQuadState(SharedQuadState::Create());
   sharedState->SetAll(gfx::Transform(), rect, rect, false, 1);
   scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
   quad->SetNew(sharedState, rect, color);
   SolidColorDrawQuad* quadPtr = quad.get();
   quadSink.append(quad.PassAs<DrawQuad>(), data);
   return quadPtr;
 }
 
+SolidColorDrawQuad* addClippedQuad(TestRenderPass* pass,
+                                   const gfx::Rect& rect,
+                                   SkColor color) {
+  MockQuadCuller quadSink(pass->quad_list, pass->shared_quad_state_list);
+  AppendQuadsData data(pass->id);
+  SharedQuadState* sharedState =
+      quadSink.useSharedQuadState(SharedQuadState::Create());
+  sharedState->SetAll(gfx::Transform(), rect, rect, true, 1);
+  scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
+  quad->SetNew(sharedState, rect, color);
+  SolidColorDrawQuad* quadPtr = quad.get();
+  quadSink.append(quad.PassAs<DrawQuad>(), data);
+  return quadPtr;
+}
+
 void addRenderPassQuad(TestRenderPass* toPass,
                        TestRenderPass* contributingPass) {
   MockQuadCuller quadSink(toPass->quad_list, toPass->shared_quad_state_list);
   AppendQuadsData data(toPass->id);
   gfx::Rect outputRect = contributingPass->output_rect;
   SharedQuadState* sharedState =
       quadSink.useSharedQuadState(SharedQuadState::Create());
   sharedState->SetAll(gfx::Transform(), outputRect, outputRect, false, 1);
   scoped_ptr<RenderPassDrawQuad> quad = RenderPassDrawQuad::Create();
   quad->SetNew(sharedState, outputRect, contributingPass->id, false, 0,
                outputRect, gfx::RectF(), WebKit::WebFilterOperations(),
                skia::RefPtr<SkImageFilter>(), WebKit::WebFilterOperations());
   quadSink.append(quad.PassAs<DrawQuad>(), data);
 }
 
 }  // namespace cc