Implement API for accessing fonts installed locally on the system.

content/renderer/font_access/web_font_access_impl.cc

+// 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 "content/renderer/font_access/web_font_access_impl.h"
+
+#include "base/bind.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/renderer/render_thread_impl.h"
+#include "mojo/public/cpp/bindings/lib/buffer.h"
+#include "third_party/WebKit/public/platform/WebData.h"
+#include "third_party/WebKit/public/platform/WebPassOwnPtr.h"
+#include "third_party/WebKit/public/platform/modules/font_access/WebFontAccessDescription.h"
+
+using blink::WebFontAccessDescription;
+using blink::WebVector;
+
+namespace content {
+
+WebFontAccessImpl::WebFontAccessImpl() {}
+
+WebFontAccessImpl::~WebFontAccessImpl() {}
+
+void WebFontAccessImpl::getFonts(blink::FontAccessCallbacks* raw_callbacks) {
+  scoped_ptr<blink::FontAccessCallbacks> callbacks(raw_callbacks);
+  GetService()->GetFontList(base::Bind(&WebFontAccessImpl::FontListHasLoaded,
+                                       base::Unretained(this),
+                                       base::Passed(&callbacks)));
+}
+
+void WebFontAccessImpl::getFontWebData(
+    const blink::WebString& family,
+    const blink::WebString& style,
+    blink::FontDataCallbacks* raw_callbacks) {
+  scoped_ptr<blink::FontDataCallbacks> callbacks(raw_callbacks);
+  GetService()->GetFontData(
+      family.utf8(), style.utf8(),
+      base::Bind(&WebFontAccessImpl::FontDataHasLoaded, base::Unretained(this),
+                 base::Passed(&callbacks)));
+}
+
+void WebFontAccessImpl::FontListHasLoaded(
+    scoped_ptr<blink::FontAccessCallbacks> callbacks,
+    mojo::Array<FontDescriptionPtr> fonts) {
+  std::vector<WebFontAccessDescription*> results;
+  for (size_t i = 0; i < fonts.size(); i++) {
+    results.push_back(new WebFontAccessDescription(
+        base::ASCIIToUTF16(fonts[i]->family.get()),

[esprehn, 2016/01/26 20:08:18]

All this code belongs in blink, please stop doing so many string conversions.

[Daniel Nishi, 2016/01/26 23:49:26]

In terms of moving the code from content to Blink, would this be an
implementation like the Geolocation Mojo-to-blink prototype patch?
(https://codereview.chromium.org/1367853002)

If so, I think there are a lot of open questions regarding Mojo-to-Blink interop
that haven't been addressed yet.

If I'm misunderstanding, please let me know.

+        base::ASCIIToUTF16(fonts[i]->style.get()),
+        base::ASCIIToUTF16(fonts[i]->fullName.get())));
+  }
+  callbacks->onSuccess(
+      blink::adoptWebPtr(new WebVector<WebFontAccessDescription*>(results)));
+}
+
+void WebFontAccessImpl::FontDataHasLoaded(
+    scoped_ptr<blink::FontDataCallbacks> callbacks,
+    mojo::ScopedSharedBufferHandle handle,
+    uint64_t size) {
+  if (size == 0) {
+    callbacks->onError();
+  }
+
+  void* data;
+  mojo::MapBuffer(
+      handle.get(), 0, size, &data,
+      MOJO_READ_DATA_FLAG_ALL_OR_NONE);
+  blink::WebData* webData = new blink::WebData(static_cast<char*>(data), size);
+  mojo::UnmapBuffer(webData);
+  callbacks->onSuccess(blink::adoptWebPtr(webData));
+}
+
+FontAccessServicePtr& WebFontAccessImpl::GetService() {
+  if (!provider_) {
+    RenderThread::Get()->GetServiceRegistry()->ConnectToRemoteService(
+        mojo::GetProxy(&provider_));
+  }
+  return provider_;
+}
+
+}  // namespace content