cc: Add a test to verify DelegatedRendererLayer owns a RenderSurface when needed.

In the test, the layer is holding quads from a tree that consisted of multiple
layers, and the quads overlap. When the DelegatedRendererLayer has opacity 1,
it does not need to own a surface here. But when it has opacity < 1, then it
does.

R=piman
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11421089

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170070 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 28 insertions, 0 deletions

diff --git a/cc/delegated_renderer_layer_impl_unittest.cc b/cc/delegated_renderer_layer_impl_unittest.cc
index 4fb4864..d37ef5b 100644
--- a/cc/delegated_renderer_layer_impl_unittest.cc
+++ b/cc/delegated_renderer_layer_impl_unittest.cc
@@ -272,6 +272,34 @@ TEST_F(DelegatedRendererLayerImplTestSimple, QuadsFromRootRenderPassAreModifiedF
     EXPECT_TRANSFORMATION_MATRIX_EQ(gfx::Transform(), frame.renderPasses[1]->quad_list[0]->quadTransform());
 }
 
+TEST_F(DelegatedRendererLayerImplTestSimple, DoesNotOwnARenderSurface)
+{
+    LayerTreeHostImpl::FrameData frame;
+    EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
+    m_hostImpl->drawLayers(frame);
+    m_hostImpl->didDrawAllLayers(frame);
+
+    // If the DelegatedRendererLayer is axis aligned and has opacity 1, then
+    // it has no need to be a renderSurface for the quads it carries.
+    EXPECT_FALSE(m_delegatedRendererLayerPtr->renderSurface());
+}
+
+TEST_F(DelegatedRendererLayerImplTestSimple, DoesOwnARenderSurface)
+{
+    m_delegatedRendererLayerPtr->setOpacity(0.5f);
+
+    LayerTreeHostImpl::FrameData frame;
+    EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
+    m_hostImpl->drawLayers(frame);
+    m_hostImpl->didDrawAllLayers(frame);
+
+    // This test case has quads from multiple layers in the delegated renderer,
+    // so if the DelegatedRendererLayer has opacity < 1, it should end up with
+    // a render surface.
+    EXPECT_TRUE(m_delegatedRendererLayerPtr->renderSurface());
+
+}
+
 class DelegatedRendererLayerImplTestOwnSurface : public DelegatedRendererLayerImplTestSimple {
 public:
     DelegatedRendererLayerImplTestOwnSurface()