Smaller initial DisplayItemList to use less memory.

third_party/WebKit/Source/platform/graphics/paint/PaintController.h

 // Copyright 2014 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.
 
 #ifndef PaintController_h
 #define PaintController_h
 
 #include "platform/PlatformExport.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 10 matching lines @@
 #include "wtf/HashMap.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Utility.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class GraphicsLayer;
 class GraphicsContext;
 
-static const size_t kInitialDisplayItemListCapacity = 64;
+static const size_t kInitialDisplayItemListCapacityBytes = 512;
 
 // Responsible for processing display items as they are produced, and producing
 // a final paint artifact when complete. This class includes logic for caching,
 // cache invalidation, and merging.
 class PLATFORM_EXPORT PaintController {
     WTF_MAKE_NONCOPYABLE(PaintController);
     WTF_MAKE_FAST_ALLOCATED(PaintController);
 public:
     static PassOwnPtr<PaintController> create()
     {
@@ skipping 113 matching lines @@
         return m_clientsCheckedPaintInvalidation.contains(client);
     }
     void setClientHasCheckedPaintInvalidation(DisplayItemClient client)
     {
         ASSERT(RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled());
         m_clientsCheckedPaintInvalidation.add(client);
     }
 
 protected:
     PaintController()
-        : m_newDisplayItemList(kInitialDisplayItemListCapacity * kMaximumDisplayItemSize)
+        : m_newDisplayItemList(kInitialDisplayItemListCapacityBytes)
         , m_validlyCachedClientsDirty(false)
         , m_constructionDisabled(false)
         , m_textPainted(false)
         , m_skippingCacheCount(0)
         , m_numCachedItems(0)
         , m_nextScope(1) { }
 
 private:
     // Set new item state (scopes, cache skipping, etc) for a new item.
     void processNewItem(DisplayItem&);
@@ skipping 79 matching lines @@
     // easily find where the duplicated ids are from.
     DisplayItemIndicesByClientMap m_newDisplayItemIndicesByClient;
 #endif
 
     OwnPtr<Vector<String>> m_trackedPaintInvalidationObjects;
 };
 
 } // namespace blink
 
 #endif // PaintController_h