Implemented GetWindowSnapshot on RenderViewImpl

ui/snapshot/snapshot.h

Index: ui/snapshot/snapshot.h
diff --git a/ui/snapshot/snapshot.h b/ui/snapshot/snapshot.h
new file mode 100644
index 0000000000000000000000000000000000000000..356309d86ac6cc10f48bf8c9f716729db47cce41
--- /dev/null
+++ b/ui/snapshot/snapshot.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2012 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 UI_SNAPSHOT_SNAPSHOT_H_
+#define UI_SNAPSHOT_SNAPSHOT_H_
+
+#include <vector>
+
+#include "ui/gfx/native_widget_types.h"
+#include "ui/snapshot/snapshot_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace ui {
+
+// Grabs a snapshot of the window/view. No security checks are done.
+// This is intended to be used for debugging purposes where no BrowserProcess
+// instance is available (ie. tests). DO NOT use in a result of user action.
+SNAPSHOT_EXPORT bool GrabWindowSnapshot(
+    gfx::NativeWindow window,
+    std::vector<unsigned char>* png_representation,
+    const gfx::Rect& snapshot_bounds);
+
+SNAPSHOT_EXPORT bool GrabViewSnapshot(
+    gfx::NativeView view,
+    std::vector<unsigned char>* png_representation,
+    const gfx::Rect& snapshot_bounds);
+
+}  // namespace ui
+
+#endif  // UI_SNAPSHOT_SNAPSHOT_H_