[devtools] Support different encodings for Page.CaptureScreenshot.

chrome/browser/chromeos/policy/remote_commands/screenshot_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_REMOTE_COMMANDS_SCREENSHOT_DELEGATE_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_REMOTE_COMMANDS_SCREENSHOT_DELEGATE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/task_runner.h"
 #include "chrome/browser/chromeos/policy/remote_commands/device_command_screenshot_job.h"
 #include "chrome/browser/chromeos/policy/upload_job.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/snapshot/snapshot.h"
 #include "url/gurl.h"
 
 namespace policy {
 
 // An implementation of the |DeviceCommandScreenshotJob::Delegate| that uses
-// aura's GrabWindowSnapshotAsync() to acquire the window snapshot.
+// aura's GrabWindowSnapshotAsyncPNG() to acquire the window snapshot.
 class ScreenshotDelegate : public DeviceCommandScreenshotJob::Delegate {
  public:
   explicit ScreenshotDelegate(
       scoped_refptr<base::TaskRunner> blocking_task_runner);
   ~ScreenshotDelegate() override;
 
   // DeviceCommandScreenshotJob::Delegate:
   bool IsScreenshotAllowed() override;
   void TakeSnapshot(
       gfx::NativeWindow window,
       const gfx::Rect& source_rect,
       const ui::GrabWindowSnapshotAsyncPNGCallback& callback) override;
   std::unique_ptr<UploadJob> CreateUploadJob(
       const GURL& upload_url,
       UploadJob::Delegate* delegate) override;
 
  private:
   void StoreScreenshot(const ui::GrabWindowSnapshotAsyncPNGCallback& callback,
-                       scoped_refptr<base::RefCountedBytes> png_data);
+                       scoped_refptr<base::RefCountedMemory> png_data);
 
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
   base::WeakPtrFactory<ScreenshotDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenshotDelegate);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_REMOTE_COMMANDS_SCREENSHOT_DELEGATE_H_