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

cc/test/render_pass_test_utils.h

Index: cc/test/render_pass_test_utils.h
diff --git a/cc/test/render_pass_test_utils.h b/cc/test/render_pass_test_utils.h
index b4d8dba4e3de64ab3b382250c58df849ba86517a..d9c2c919f8c0b5bab6baf5a22935607f784ee225 100644
--- a/cc/test/render_pass_test_utils.h
+++ b/cc/test/render_pass_test_utils.h
@@ -32,6 +32,11 @@ 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);