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

ui/snapshot/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 
 component("snapshot") {
   sources = [
+    "screenshot_taker.cc",
+    "screenshot_taker.h"

[Jun Mukai, 2014/11/18 21:56:15]

They are currently only for ash right?

[flackr, 2014/11/20 00:06:07]

Currently only used by ash, but should technically work on other platforms since
it's using snapshot of a NativeWindow. I can exclude compilation on other
platforms though.

     "snapshot.h",
     "snapshot_android.cc",
     "snapshot_async.cc",
     "snapshot_async.h",
     "snapshot_aura.cc",
     "snapshot_export.h",
     "snapshot_ios.mm",
     "snapshot_mac.mm",
   ]
 
@@ skipping 55 matching lines @@
     deps += [
       "//ui/aura:test_support",
       "//ui/compositor",
       "//ui/compositor:test_support",
       "//ui/wm",
     ]
   } else {
     sources -= [ "snapshot_aura_unittest.cc" ]
   }
 }