Clipping textured quads explicitly without scissoring

cc/texture_layer_impl.cc

Index: cc/texture_layer_impl.cc
diff --git a/cc/texture_layer_impl.cc b/cc/texture_layer_impl.cc
index e8a68741855891ef8d8e1317942c96484d7994bc..dd764a0572fd45044b0b8bb4c0074c387463e2fa 100644
--- a/cc/texture_layer_impl.cc
+++ b/cc/texture_layer_impl.cc
@@ -45,7 +45,12 @@ void TextureLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQu
     gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
     quad->SetNew(sharedQuadState, quadRect, opaqueRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_flipped);
-    quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
+
+    // Perform explicit clipping on a quad to avoid setting a scissor later.
+    if (sharedQuadState->is_clipped && quad->PerformClipping())
+        sharedQuadState->is_clipped = false;
+    if (!quad->rect.IsEmpty())
+        quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
 }
 
 void TextureLayerImpl::didDraw(ResourceProvider* resourceProvider)