First fix to minimize copying of image data.

chrome/browser/browser_theme_provider.h

 // Copyright (c) 2009 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 CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 #define CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 144 matching lines @@
     REPEAT = 3
   } Tiling;
 
   // ThemeProvider implementation.
   virtual void Init(Profile* profile);
   virtual SkBitmap* GetBitmapNamed(int id) const;
   virtual SkColor GetColor(int id) const;
   virtual bool GetDisplayProperty(int id, int* result) const;
   virtual bool ShouldUseNativeFrame() const;
   virtual bool HasCustomImage(int id) const;
-  virtual bool GetRawData(int id, std::vector<unsigned char>* raw_data) const;
+  virtual RefCountedMemory* GetRawData(int id) const;
 #if defined(OS_LINUX)
   virtual GdkPixbuf* GetPixbufNamed(int id) const;
   virtual GdkPixbuf* GetRTLEnabledPixbufNamed(int id) const;
 #elif defined(OS_MACOSX)
   virtual NSImage* GetNSImageNamed(int id) const;
   virtual NSColor* GetNSColor(int id) const;
   virtual NSColor* GetNSColorTint(int id) const;
 #endif
 
   // Set the current theme to the theme defined in |extension|.
   virtual void SetTheme(Extension* extension);
 
   // Reset the theme to default.
   virtual void UseDefaultTheme();
 
   // Set the current theme to the native theme. On some platforms, the native
   // theme is the default theme.
   virtual void SetNativeTheme() { UseDefaultTheme(); }
 
   // Gets the id of the last installed theme. (The theme may have been further
   // locally customized.)
   std::string GetThemeID() const;
 
   // Reads the image data from the theme file into the specified vector. Returns
   // true on success.
-  bool ReadThemeFileData(int id, std::vector<unsigned char>* raw_data) const;
+  RefCountedMemory* ReadThemeFileData(int id) const;
 
   // Convert a bitfield alignment into a string like "top left". Public so that
   // it can be used to generate CSS values. Takes a bitfield of AlignmentMasks.
   static std::string AlignmentToString(int alignment);
 
   // Parse alignments from something like "top left" into a bitfield of
   // AlignmentMasks
   static int StringToAlignment(const std::string& alignment);
 
   // Convert a tiling value into a string like "no-repeat". Public
@@ skipping 68 matching lines @@
 
   // Subclasses may need us to not use the on-disk image cache. The GTK
   // interface needs to generate some images itself.
   void force_process_images() { process_images_ = true; }
 
  private:
   typedef std::map<const int, std::string> ImageMap;
   typedef std::map<const std::string, SkColor> ColorMap;
   typedef std::map<const std::string, color_utils::HSL> TintMap;
   typedef std::map<const std::string, int> DisplayPropertyMap;
-  typedef std::map<const int, std::vector<unsigned char> > RawDataMap;
+  typedef std::map<const int, scoped_refptr<RefCountedMemory> > RawDataMap;
   typedef std::map<const int, std::string> ResourceNameMap;
 
   // Returns the string key for the given tint |id| TINT_* enum value.
   const std::string GetTintKey(int id) const;
 
   // Returns the default tint for the given tint |id| TINT_* enum value.
   color_utils::HSL GetDefaultTint(int id) const;
 
   // Returns the string key for the given color |id| COLOR_* enum value.
   const std::string GetColorKey(int id) const;
@@ skipping 91 matching lines @@
   // If true, process all images; if false, just load from disk.
   bool process_images_;
 
   // Where we will store our generated images.
   FilePath image_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemeProvider);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_