Verify returned frames from media::VideoFrame::Wrap*() methods

cc/trees/layer_tree_host_unittest_context.cc

Index: cc/trees/layer_tree_host_unittest_context.cc
diff --git a/cc/trees/layer_tree_host_unittest_context.cc b/cc/trees/layer_tree_host_unittest_context.cc
index 314e4841049957b6169eaa7febcf68c81b0c1d22..c84cc800a03c5ab45c0a598e041dff4974f025e4 100644
--- a/cc/trees/layer_tree_host_unittest_context.cc
+++ b/cc/trees/layer_tree_host_unittest_context.cc
@@ -1022,16 +1022,19 @@ class LayerTreeHostContextTestDontUseLostResources
 
     color_video_frame_ = VideoFrame::CreateColorFrame(
         gfx::Size(4, 4), 0x80, 0x80, 0x80, base::TimeDelta());
+    ASSERT_TRUE(color_video_frame_);
     hw_video_frame_ = VideoFrame::WrapNativeTexture(
         media::PIXEL_FORMAT_ARGB,
         gpu::MailboxHolder(mailbox, sync_token, GL_TEXTURE_2D),
         media::VideoFrame::ReleaseMailboxCB(), gfx::Size(4, 4),
         gfx::Rect(0, 0, 4, 4), gfx::Size(4, 4), base::TimeDelta());
+    ASSERT_TRUE(hw_video_frame_);
     scaled_hw_video_frame_ = VideoFrame::WrapNativeTexture(
         media::PIXEL_FORMAT_ARGB,
         gpu::MailboxHolder(mailbox, sync_token, GL_TEXTURE_2D),
         media::VideoFrame::ReleaseMailboxCB(), gfx::Size(4, 4),
         gfx::Rect(0, 0, 3, 2), gfx::Size(4, 4), base::TimeDelta());
+    ASSERT_TRUE(scaled_hw_video_frame_);
 
     color_frame_provider_.set_frame(color_video_frame_);
     hw_frame_provider_.set_frame(hw_video_frame_);