Quick 'low-risk-for-the-next-release' fix to increase theme install/load perf...

chrome/browser/browser_theme_provider.cc

 // 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.
 
 #include "chrome/browser/browser_theme_provider.h"
 
 #include "base/gfx/png_decoder.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/browser_list.h"
@@ skipping 801 matching lines @@
     // The requested image is a background tab. Get a frame to create the
     // tab against. As themes don't use the glass frame, we don't have to
     // worry about compositing them together, as our default theme provides
     // the necessary bitmaps.
     int base_id = (id == IDR_THEME_TAB_BACKGROUND) ?
         IDR_THEME_FRAME : IDR_THEME_FRAME_INCOGNITO;
 
     std::map<int, SkBitmap*>::iterator it = image_cache_.find(base_id);
     if (it != image_cache_.end()) {
       SkBitmap* frame = it->second;
-      int blur_amount = (HasCustomImage(id)) ? 1 : 5;
+      int blur_amount = (HasCustomImage(id)) ? 1 : 2;
       SkBitmap blurred =
           skia::ImageOperations::CreateBlurredBitmap(*frame, blur_amount);
       SkBitmap* bg_tab = new SkBitmap(TintBitmap(blurred, TINT_BACKGROUND_TAB));
 
       // If they've provided a custom image, overlay it.
       if (HasCustomImage(id)) {
         SkBitmap* overlay = LoadThemeBitmap(id);
         if (overlay) {
           SkCanvas canvas(*bg_tab);
           for (int x = 0; x < bg_tab->width(); x += overlay->width())
@@ skipping 147 matching lines @@
     delete i->second;
   }
   image_cache_.clear();
 }
 
 #if defined(TOOLKIT_VIEWS)
 void BrowserThemeProvider::FreePlatformCaches() {
   // Views (Skia) has no platform image cache to clear.
 }
 #endif