Fix for Issue 331895: Make gesturenav screenshot greyscale

content/browser/frame_host/navigation_entry_screenshot_manager.cc

 // Copyright 2013 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 "content/browser/frame_host/navigation_entry_screenshot_manager.h"
 
 #include "base/command_line.h"
 #include "base/threading/worker_pool.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
@@ skipping 31 matching lines @@
 
   scoped_refptr<base::RefCountedBytes> data() const { return data_; }
 
  private:
   friend class base::RefCountedThreadSafe<ScreenshotData>;
   virtual ~ScreenshotData() {
   }
 
   void EncodeOnWorker(const SkBitmap& bitmap) {
     std::vector<unsigned char> data;
-    if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &data))
+    if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &data, true))
       data_ = new base::RefCountedBytes(data);
   }
 
   scoped_refptr<base::RefCountedBytes> data_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenshotData);
 };
 
 NavigationEntryScreenshotManager::NavigationEntryScreenshotManager(
     NavigationControllerImpl* owner)
@@ skipping 204 matching lines @@
         owner_->GetEntryAtIndex(forward));
     if (ClearScreenshot(entry))
       --screenshot_count;
     ++forward;
   }
   CHECK_GE(screenshot_count, 0);
   CHECK_LE(screenshot_count, kMaxScreenshots);
 }
 
 }  // namespace content