Use PrintWindow() to implement snapshots on windows 8.1+

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")
 import("//testing/test.gni")
 
 component("snapshot") {
   sources = [
     "screenshot_grabber.cc",
     "screenshot_grabber.h",
     "screenshot_grabber_observer.h",
     "snapshot.cc",
     "snapshot.h",
     "snapshot_android.cc",
     "snapshot_async.cc",
     "snapshot_async.h",
     "snapshot_aura.cc",
-    "snapshot_export.h",
+    "snapshot_aura.h",
     "snapshot_ios.mm",
     "snapshot_mac.mm",
+    "snapshot_win.cc",
   ]
 
   defines = [ "SNAPSHOT_IMPLEMENTATION" ]
 
   deps = [
+    ":snapshot_export",
+    ":snapshot_win",
     "//base",
     "//skia",
     "//ui/base",
     "//ui/display",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (is_android && !use_aura) {
     deps += [ "//ui/android" ]
@@ skipping 14 matching lines @@
   if (is_android && use_aura) {
     sources -= [ "snapshot_android.cc" ]
   }
 
   if (use_aura) {
     deps += [
       "//ui/aura",
       "//ui/compositor",
     ]
   } else {
-    sources -= [ "snapshot_aura.cc" ]
+    sources -= [
+      "snapshot_aura.cc",
+      "snapshot_aura.h",
+    ]
   }
 
   if (is_mac) {
     libs = [
       "AppKit.framework",
       "CoreGraphics.framework",
     ]
   }
 }
 
+source_set("snapshot_win") {
+  sources = [
+    "snapshot_win.h",
+  ]
+  deps = [
+    ":snapshot_export",
+  ]
+  visibility = [ ":*" ]
+}
+
+source_set("snapshot_export") {
+  sources = [
+    "snapshot_export.h",
+  ]
+  visibility = [ ":*" ]
+}
+
 test("snapshot_unittests") {
   sources = [
     "snapshot_aura_unittest.cc",
     "snapshot_mac_unittest.mm",
     "test/run_all_unittests.cc",
   ]
 
   deps = [
     ":snapshot",
     "//base",
@@ skipping 12 matching lines @@
     deps += [
       "//ui/aura:test_support",
       "//ui/compositor",
       "//ui/compositor:test_support",
       "//ui/wm",
     ]
   } else {
     sources -= [ "snapshot_aura_unittest.cc" ]
   }
 }