Enable precompiled headers for Blink on Windows.

third_party/WebKit/Source/platform/win/Precompile-platform.h

Index: third_party/WebKit/Source/platform/win/Precompile-platform.h
diff --git a/third_party/WebKit/Source/platform/win/Precompile-platform.h b/third_party/WebKit/Source/platform/win/Precompile-platform.h
new file mode 100644
index 0000000000000000000000000000000000000000..ec825772d5027310b86869e1979b8a5f7d1997e6
--- /dev/null
+++ b/third_party/WebKit/Source/platform/win/Precompile-platform.h
@@ -0,0 +1,14 @@
+// Copyright 2016 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.
+
+#if defined(PrecompilePlatform_h_)
+#error You shouldn't include the precompiled header file more than once.
+#endif
+
+#define PrecompilePlatform_h_
+
+#include "build/win/Precompile.h"
+
+// Include Oilpan's Handle.h by default, and all it refers to.

[Nico, 2016/11/21 15:42:25]

comments should say why, not (just) what

[sof, 2016/11/21 19:24:58]

Adjusted.

+#include "platform/heap/Handle.h"