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 95d21b2d4cd5c06733100281e20f2890dee8363e..2b02f8a080a4d52ae78dd9d156d5fb323e256065 100644
--- a/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
+++ b/third_party/WebKit/Source/platform/graphics/ContiguousContainer.h
@@ -60,6 +60,10 @@ protected:
     void clear();
     void swap(ContiguousContainerBase&);
 
+    // Discards excess bufer capacity. Intended for use when no more appending
+    // is anticipated.
+    void removeEmptyBuffers();

[pdr., 2016/07/12 02:19:51]

ContiguousContainer's buffers are sort of an internal implementation detail. Can
we avoid exposing this publicly? For example, we could rename this
"shrinkToFit()" or "compactUnusedMemory()"?

[Xianzhu, 2016/07/12 17:56:47]

Done.

+
     Vector<void*> m_elements;
 
 private:
@@ -142,6 +146,7 @@ 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()); }