Preparation for enabling slimming paint synchronized painting

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 2b2ec9c4267bc42879927ba9be05f8571a3811a9..5033035c9d7396472ae0a246e189917d70616eee 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -299,7 +299,20 @@ void GraphicsLayer::paintIfNeeded(GraphicsContext& context)
     if (firstPaintInvalidationTrackingEnabled())
         m_debugInfo.clearAnnotatedInvalidateRects();
     incrementPaintCount();
+#ifndef NDEBUG
+    if (m_paintController && contentsOpaque() && s_drawDebugRedFill) {
+        FloatRect rect(FloatPoint(), size());
+        if (!DrawingRecorder::useCachedDrawingIfPossible(context, *this, DisplayItem::DebugRedFill)) {
+            DrawingRecorder recorder(context, *this, DisplayItem::DebugRedFill, rect);
+            context.fillRect(rect, SK_ColorRED);
+        }
+    }
+#endif

[Xianzhu, 2015/10/28 18:10:23]

These are copied from GraphicsLayer::paint().

Perhaps we can combine paintIfNeeded() and paint(). I have another CL for this
(WIP): https://codereview.chromium.org/1428643004.

     m_client->paintContentsIfNeeded(this, context, m_paintingPhase);
+    if (!m_textPainted && m_paintController->textPainted()) {
+        m_textPainted = true;
+        m_client->notifyTextPainted();
+    }
 }
 
 void GraphicsLayer::paint(GraphicsContext& context, const IntRect& clip)