cc: Make RenderPassAndMaskWithPartialQuad not use arbitrary uvs

cc/output/renderer_pixeltest.cc

Index: cc/output/renderer_pixeltest.cc
diff --git a/cc/output/renderer_pixeltest.cc b/cc/output/renderer_pixeltest.cc
index 00c91008e29bfc51bcb60b2b742765462058f4c2..6a770e6f29e937b5f8bd06bb7da8939a1bc6f3fb 100644
--- a/cc/output/renderer_pixeltest.cc
+++ b/cc/output/renderer_pixeltest.cc
@@ -1223,12 +1223,11 @@ TYPED_TEST(RendererPixelTest, RenderPassAndMaskWithPartialQuad) {
 
   // This RenderPassDrawQuad does not include the full |viewport_rect| which is
   // the size of the child render pass.
-  gfx::Rect sub_rect = gfx::Rect(50, 50, 100, 100);
+  gfx::Rect sub_rect = gfx::Rect(50, 50, 200, 100);
   EXPECT_NE(sub_rect.x(), child_pass->output_rect.x());
   EXPECT_NE(sub_rect.y(), child_pass->output_rect.y());
   EXPECT_NE(sub_rect.right(), child_pass->output_rect.right());
   EXPECT_NE(sub_rect.bottom(), child_pass->output_rect.bottom());
-  EXPECT_TRUE(child_pass->output_rect.Contains(sub_rect));
 
   // Set up a mask on the RenderPassDrawQuad.
   RenderPassDrawQuad* mask_quad =
@@ -1238,10 +1237,10 @@ TYPED_TEST(RendererPixelTest, RenderPassAndMaskWithPartialQuad) {
                     sub_rect,
                     child_pass_id,
                     mask_resource_id,
-                    gfx::RectF(1.f, 1.f),  // mask_uv_rect
-                    FilterOperations(),    // foreground filters
-                    gfx::Vector2dF(),      // filters scale
-                    FilterOperations());   // background filters
+                    gfx::RectF(0.5f, 0.5f, 2.f, 1.f),  // mask_uv_rect
+                    FilterOperations(),                // foreground filters
+                    gfx::Vector2dF(),                  // filters scale
+                    FilterOperations());               // background filters
 
   // White background behind the masked render pass.
   SolidColorDrawQuad* white =
@@ -1258,7 +1257,7 @@ TYPED_TEST(RendererPixelTest, RenderPassAndMaskWithPartialQuad) {
 
   EXPECT_TRUE(this->RunPixelTest(
       &pass_list,
-      base::FilePath(FILE_PATH_LITERAL("image_mask_of_layer.png")),
+      base::FilePath(FILE_PATH_LITERAL("mask_bottom_right.png")),
       ExactPixelComparator(true)));
 }