Roll cc snapshot up to 127605

cc/CCLayerTreeHostImplTest.cpp

Index: cc/CCLayerTreeHostImplTest.cpp
diff --git a/cc/CCLayerTreeHostImplTest.cpp b/cc/CCLayerTreeHostImplTest.cpp
index f46cfdaf35403129ce164ed5bc4af9bcf8605dac..8dc6752db6be8816cb666ea4d31a116cac496784 100644
--- a/cc/CCLayerTreeHostImplTest.cpp
+++ b/cc/CCLayerTreeHostImplTest.cpp
@@ -50,7 +50,8 @@ namespace {
 class CCLayerTreeHostImplTest : public testing::Test, public CCLayerTreeHostImplClient {
 public:
     CCLayerTreeHostImplTest()
-        : m_didRequestCommit(false)
+        : m_onCanDrawStateChangedCalled(false)
+        , m_didRequestCommit(false)
         , m_didRequestRedraw(false)
     {
         CCLayerTreeSettings settings;
@@ -64,6 +65,7 @@ public:
     virtual void didLoseContextOnImplThread() OVERRIDE { }
     virtual void onSwapBuffersCompleteOnImplThread() OVERRIDE { }
     virtual void onVSyncParametersChanged(double, double) OVERRIDE { }
+    virtual void onCanDrawStateChanged(bool canDraw) OVERRIDE { m_onCanDrawStateChangedCalled = true; }
     virtual void setNeedsRedrawOnImplThread() OVERRIDE { m_didRequestRedraw = true; }
     virtual void setNeedsCommitOnImplThread() OVERRIDE { m_didRequestCommit = true; }
     virtual void postAnimationEventsToMainThreadOnImplThread(PassOwnPtr<CCAnimationEventsVector>, double wallClockTime) OVERRIDE { }
@@ -165,6 +167,7 @@ protected:
     DebugScopedSetMainThreadBlocked m_alwaysMainThreadBlocked;
 
     OwnPtr<CCLayerTreeHostImpl> m_hostImpl;
+    bool m_onCanDrawStateChangedCalled;
     bool m_didRequestCommit;
     bool m_didRequestRedraw;
     CCScopedSettings m_scopedSettings;
@@ -175,6 +178,53 @@ public:
     virtual bool makeContextCurrent() { return false; }
 };
 
+TEST_F(CCLayerTreeHostImplTest, notifyIfCanDrawChanged)
+{
+    // Note: It is not possible to disable the renderer once it has been set,
+    // so we do not need to test that disabling the renderer notifies us
+    // that canDraw changed.
+    EXPECT_FALSE(m_hostImpl->canDraw());
+    m_onCanDrawStateChangedCalled = false;
+
+    setupScrollAndContentsLayers(IntSize(100, 100));
+    EXPECT_TRUE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    // Toggle the root layer to make sure it toggles canDraw
+    m_hostImpl->setRootLayer(adoptPtr<CCLayerImpl>(0));
+    EXPECT_FALSE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    setupScrollAndContentsLayers(IntSize(100, 100));
+    EXPECT_TRUE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    // Toggle the device viewport size to make sure it toggles canDraw.
+    m_hostImpl->setViewportSize(IntSize(100, 100), IntSize(0, 0));
+    EXPECT_FALSE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    m_hostImpl->setViewportSize(IntSize(100, 100), IntSize(100, 100));
+    EXPECT_TRUE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    // Toggle contents textures purged to make sure it toggles canDraw
+    m_hostImpl->releaseContentsTextures();
+    EXPECT_FALSE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+
+    m_hostImpl->resetContentsTexturesPurged();
+    EXPECT_TRUE(m_hostImpl->canDraw());
+    EXPECT_TRUE(m_onCanDrawStateChangedCalled);
+    m_onCanDrawStateChangedCalled = false;
+}
+
 TEST_F(CCLayerTreeHostImplTest, scrollDeltaNoLayers)
 {
     ASSERT_FALSE(m_hostImpl->rootLayer());