Find cached display items directly during painting

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/ContiguousContainer.h"
 
 #include "wtf/Allocator.h"
 #include "wtf/ContainerAnnotations.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/allocator/PartitionAlloc.h"
@@ skipping 153 matching lines @@
 }
 
 void ContiguousContainerBase::swap(ContiguousContainerBase& other)
 {
     m_elements.swap(other.m_elements);
     m_buffers.swap(other.m_buffers);
     std::swap(m_endIndex, other.m_endIndex);
     std::swap(m_maxObjectSize, other.m_maxObjectSize);
 }
 
+void ContiguousContainerBase::shrinkToFit()
+{
+    while (m_endIndex < m_buffers.size() - 1) {
+        DCHECK(m_buffers.last()->isEmpty());
+        m_buffers.removeLast();
+    }
+}
+
 ContiguousContainerBase::Buffer*
 ContiguousContainerBase::allocateNewBufferForNextAllocation(size_t bufferSize, const char* typeName)
 {
     ASSERT(m_buffers.isEmpty() || m_endIndex == m_buffers.size() - 1);
     std::unique_ptr<Buffer> newBuffer = wrapUnique(new Buffer(bufferSize, typeName));
     Buffer* bufferToReturn = newBuffer.get();
     m_buffers.append(std::move(newBuffer));
     m_endIndex = m_buffers.size() - 1;
     return bufferToReturn;
 }
 
 } // namespace blink