2D Canvas doesn't blend video with the destination buffer.

media/filters/skcanvas_video_renderer_unittest.cc

Index: media/filters/skcanvas_video_renderer_unittest.cc
diff --git a/media/filters/skcanvas_video_renderer_unittest.cc b/media/filters/skcanvas_video_renderer_unittest.cc
index 5db3a34d6cfa260029c62ddd8b4c1ba5b56a8875..523aab05b491a2d40ebe6298550e6e0d5f9518cb 100644
--- a/media/filters/skcanvas_video_renderer_unittest.cc
+++ b/media/filters/skcanvas_video_renderer_unittest.cc
@@ -52,7 +52,10 @@ class SkCanvasVideoRendererTest : public testing::Test {
 
   // Paints the |video_frame| to the |canvas| using |renderer_|, setting the
   // color of |video_frame| to |color| first.
-  void Paint(VideoFrame* video_frame, SkCanvas* canvas, Color color);
+  void Paint(VideoFrame* video_frame,
+             SkCanvas* canvas,
+             Color color,
+             SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode);
 
   // Getters for various frame sizes.
   VideoFrame* natural_frame() { return natural_frame_.get(); }
@@ -185,12 +188,13 @@ SkCanvasVideoRendererTest::SkCanvasVideoRendererTest()
 SkCanvasVideoRendererTest::~SkCanvasVideoRendererTest() {}
 
 void SkCanvasVideoRendererTest::PaintWithoutFrame(SkCanvas* canvas) {
-  renderer_.Paint(NULL, canvas, kNaturalRect, 0xFF);
+  renderer_.Paint(NULL, canvas, kNaturalRect, 0xFF, SkXfermode::kSrcOver_Mode);
 }
 
 void SkCanvasVideoRendererTest::Paint(VideoFrame* video_frame,
                                       SkCanvas* canvas,
-                                      Color color) {
+                                      Color color,
+                                      SkXfermode::Mode mode) {
   switch (color) {
     case kNone:
       break;
@@ -204,7 +208,7 @@ void SkCanvasVideoRendererTest::Paint(VideoFrame* video_frame,
       media::FillYUV(video_frame, 29, 255, 107);
       break;
   }
-  renderer_.Paint(video_frame, canvas, kNaturalRect, 0xFF);
+  renderer_.Paint(video_frame, canvas, kNaturalRect, 0xFF, mode);
 }
 
 TEST_F(SkCanvasVideoRendererTest, NoFrame) {
@@ -215,11 +219,20 @@ TEST_F(SkCanvasVideoRendererTest, NoFrame) {
 }
 
 TEST_F(SkCanvasVideoRendererTest, TransparentFrame) {
-  // Test that we don't blend with existing canvas contents.
   FillCanvas(target_canvas(), SK_ColorRED);
   Paint(VideoFrame::CreateTransparentFrame(gfx::Size(kWidth, kHeight)),
         target_canvas(),
         kNone);
+  EXPECT_EQ(static_cast<SkColor>(SK_ColorRED), GetColor(target_canvas()));
+}
+
+TEST_F(SkCanvasVideoRendererTest, TransparentFrameSrcMode) {
+  FillCanvas(target_canvas(), SK_ColorRED);
+  // SRC mode completely overwrites the buffer.
+  Paint(VideoFrame::CreateTransparentFrame(gfx::Size(kWidth, kHeight)),
+        target_canvas(),
+        kNone,
+        SkXfermode::kSrc_Mode);
   EXPECT_EQ(static_cast<SkColor>(SK_ColorTRANSPARENT),
             GetColor(target_canvas()));
 }