Use PrintWindow() to implement snapshots on windows 8.1+

ui/snapshot/BUILD.gn

Index: ui/snapshot/BUILD.gn
diff --git a/ui/snapshot/BUILD.gn b/ui/snapshot/BUILD.gn
index 4685e1b6844ea5e5c0509c7db496433780fab788..7e2c28806ef3d5221ffe3430ff04998931914d4b 100644
--- a/ui/snapshot/BUILD.gn
+++ b/ui/snapshot/BUILD.gn
@@ -16,14 +16,17 @@ component("snapshot") {
     "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",
@@ -58,7 +61,10 @@ component("snapshot") {
       "//ui/compositor",
     ]
   } else {
-    sources -= [ "snapshot_aura.cc" ]
+    sources -= [
+      "snapshot_aura.cc",
+      "snapshot_aura.h",
+    ]
   }
 
   if (is_mac) {
@@ -69,6 +75,23 @@ component("snapshot") {
   }
 }
 
+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",