Mojo C++ bindings: make String16 and gfx::Size available in Blink

third_party/WebKit/Source/platform/mojo/CommonCustomTypesStructTraits.cpp

+// 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.
+
+#include "platform/mojo/CommonCustomTypesStructTraits.h"
+
+#include "mojo/public/cpp/bindings/array_traits_wtf_vector.h"
+#include "wtf/text/WTFString.h"
+#include <cstring>
+
+namespace mojo {
+
+// static
+WTF::Vector<uint16_t>
+StructTraits<mojo::common::mojom::String16DataView, ::blink::WebString>::data(
+    const ::blink::WebString& str) {
+  DCHECK(!str.isNull())
+      << "mojo::common::mojom::String16 only accepts non-null blink::WebString";
+  WTF::String str16 = str;
+  str16.ensure16Bit();
+  WTF::Vector<uint16_t> rawData(str16.length());

[Ken Rockot(use gerrit already), 2016/10/04 06:28:40]

And similarly you can use ArrayDataView here as well to avoid another copy.

[Zhiqiang Zhang (Slow), 2016/10/04 13:21:59]

Done.

+  memcpy(rawData.data(), str16.characters16(),
+         str16.length() * sizeof(uint16_t));
+  return rawData;
+}
+
+// static
+bool StructTraits<mojo::common::mojom::String16DataView, ::blink::WebString>::
+    Read(mojo::common::mojom::String16DataView data, ::blink::WebString* out) {
+  WTF::Vector<uint16_t> rawData;
+  if (!data.ReadData(&rawData))
+    return false;
+  *out = ::blink::WebString(
+      reinterpret_cast<::blink::WebUChar*>(rawData.begin()), rawData.size());
+  return true;
+}
+
+}  // namespace mojo