Create PaintChunk and begin writing code to build paint chunks.

third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp b/third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp
index 146a0352723d772664343bbb6d559903c527d521..1b98dac015bcf0a0beafa2169175d1b17bee5d6b 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/SubsequenceRecorder.cpp
@@ -20,6 +20,11 @@ bool SubsequenceRecorder::useCachedSubsequenceIfPossible(GraphicsContext& contex
 
     ASSERT(context.displayItemList());
 
+    // TODO(jbroman): When SPv2 paint property code can handle it, don't skip

[pdr., 2015/10/01 00:32:48]

I think we should hold off on turning off subsequences for now, since Xianzhu is
still working on them a bit and it'll require updating a bunch of tests.
Instead, lets just rely on your comment in commitNewDisplayItems.

[jbroman, 2015/10/01 18:04:20]

Done.

+    // subsequence recording.
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+        return false;
+
     if (context.displayItemList()->displayItemConstructionIsDisabled())
         return false;
 
@@ -46,6 +51,11 @@ SubsequenceRecorder::SubsequenceRecorder(GraphicsContext& context, const Display
     if (!RuntimeEnabledFeatures::slimmingPaintSubsequenceCachingEnabled())
         return;
 
+    // TODO(jbroman): When SPv2 paint property code can handle it, don't skip
+    // subsequence recording.
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+        return;
+
     ASSERT(m_displayItemList);
     if (m_displayItemList->displayItemConstructionIsDisabled())
         return;