Find cached display items directly during painting

third_party/WebKit/Source/platform/graphics/ContiguousContainer.h

Index: third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
diff --git a/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h b/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
index a50431becefb31c3ab4a231c74212f66ea67bf33..94921d55002cee9f6cb6e8c742c7c2a6b6f8a472 100644
--- a/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
+++ b/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
@@ -59,6 +59,7 @@ protected:
     void removeLast();
     void clear();
     void swap(ContiguousContainerBase&);
+    void removeEmptyBuffers();

[jbroman, 2016/07/06 19:09:37]

Mind a comment clarifying the intended use of this? I'm a little worried it will
imply that we otherwise never discard buffers. Something like:

// Discards excess buffer capacity. Intended for use when no more appending is
anticipated.

[Xianzhu, 2016/07/06 19:29:34]

Done.

 
     Vector<void*> m_elements;
 
@@ -142,6 +143,7 @@ public:
     using ContiguousContainerBase::capacityInBytes;
     using ContiguousContainerBase::usedCapacityInBytes;
     using ContiguousContainerBase::memoryUsageInBytes;
+    using ContiguousContainerBase::removeEmptyBuffers;
 
     iterator begin() { return iterator(m_elements.begin()); }
     iterator end() { return iterator(m_elements.end()); }