Move non-browser specific ScreenshotTaker code to ui/snapshot.

ui/snapshot/screenshot_grabber_observer.h

Index: ui/snapshot/screenshot_grabber_observer.h
diff --git a/ui/snapshot/screenshot_grabber_observer.h b/ui/snapshot/screenshot_grabber_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..4d90306bb79deca7d2e29d3f277be9d7437d21bd
--- /dev/null
+++ b/ui/snapshot/screenshot_grabber_observer.h
@@ -0,0 +1,39 @@
+// Copyright 2014 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_SCREENSHOT_GRABBER_OBSERVER_H_
+#define UI_SNAPSHOT_SCREENSHOT_GRABBER_OBSERVER_H_
+
+#include "base/files/file_path.h"
+#include "ui/snapshot/snapshot_export.h"
+
+namespace ui {
+
+class SNAPSHOT_EXPORT ScreenshotGrabberObserver {
+ public:
+  enum Result {
+    SCREENSHOT_SUCCESS = 0,
+    SCREENSHOT_GRABWINDOW_PARTIAL_FAILED,
+    SCREENSHOT_GRABWINDOW_FULL_FAILED,
+    SCREENSHOT_CREATE_DIR_FAILED,
+    SCREENSHOT_GET_DIR_FAILED,
+    SCREENSHOT_CHECK_DIR_FAILED,
+    SCREENSHOT_CREATE_FILE_FAILED,
+    SCREENSHOT_WRITE_FILE_FAILED,
+    SCREENSHOTS_DISABLED,
+    SCREENSHOT_RESULT_COUNT
+  };
+
+  // Dispatched after attempting to take a screenshot with the |result| and
+  // |screenshot_path| of the taken screenshot (if successful).
+  virtual void OnScreenshotCompleted(Result screenshot_result,
+                                     const base::FilePath& screenshot_path) = 0;
+
+ protected:
+  virtual ~ScreenshotGrabberObserver() {}
+};
+
+}  // namespace ui
+
+#endif  // UI_SNAPSHOT_SCREENSHOT_GRABBER_OBSERVER_H_