Create direct write font proxy classes and unit tests.

content/test/dwrite_font_fake_sender_win.h

+// Copyright (c) 2015 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.
+
+#ifndef CONTENT_TEST_DWRITE_FONT_FAKE_SENDER_WIN_H_
+#define CONTENT_TEST_DWRITE_FONT_FAKE_SENDER_WIN_H_
+
+#include <wrl.h>
+
+#include <utility>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/string16.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_sender.h"
+
+namespace content {
+
+class FakeFontCollection;
+
+// Creates a new FakeFontCollection, seeded with some basic data, and returns a
+// Sender that can be used to interact with the collection.
+IPC::Sender* CreateFakeCollectionSender();
+
+// Helper class for describing a font object. Use FakeFontCollection instead.
+class FakeFont {
+ public:
+  explicit FakeFont(const base::string16& name) : font_name_(name) {}
+
+  ~FakeFont();
+
+  FakeFont& AddFilePath(const base::string16& file_path) {
+    file_paths_.push_back(file_path);
+    return *this;
+  }
+
+  FakeFont& AddFamilyName(const base::string16& locale,
+                          const base::string16& family_name) {
+    family_names_.emplace_back(locale, family_name);
+    return *this;
+  }
+
+ private:
+  friend FakeFontCollection;
+  base::string16 font_name_;
+  std::vector<base::string16> file_paths_;
+  std::vector<std::pair<base::string16, base::string16>> family_names_;
+
+  DISALLOW_ASSIGN(FakeFont);
+};
+
+// Implements a font collection that supports interaction through sending IPC
+// messages from dwrite_font_proxy_messages.h.
+// Usage:
+//   Create a new FakeFontCollection.
+//   Call AddFont() to add fonts.
+//     For each font, call methods on the font to configure the font.
+//     Note: the indices of the fonts will correspond to the order they were
+//         added. The collection will not sort or reorder fonts in any way.
+//   Call GetSender()/GetTrackingSender() to obtain an IPC::Sender.
+//   Call Send() with DWriteFontProxyMsg_* to interact with the collection.
+//   Call MessageCount()/GetMessage() to inspect the messages that were sent.
+//
+// The internal code flow for GetSender()/Send() is as follows:
+//   GetSender() returns a new FakeSender, pointing back to the collection.
+//   FakeSender::Send() will create a new ReplySender and call
+//       ReplySender::OnMessageReceived()
+//   ReplySender::OnMessageReceived() contains the message map, which will
+//       internally call ReplySender::On*() and ReplySender::Send()
+//   ReplySender::Send() will save the reply message, to be used later.
+//   FakeSender::Send() will retrieve the reply message and save the output.
+class FakeFontCollection : public base::RefCounted<FakeFontCollection> {
+ public:
+  FakeFontCollection() = default;
+
+  FakeFont& AddFont(const base::string16& font_name);
+
+  unsigned int MessageCount();
+
+  IPC::Message* GetMessage(unsigned int index);
+
+  IPC::Sender* GetSender();
+
+  // Like GetSender(), but will keep track of all sent messages for inspection.
+  IPC::Sender* GetTrackingSender();
+
+ protected:
+  // This class handles sending the reply message back to the "renderer"
+  class ReplySender : public IPC::Sender {
+   public:
+    explicit ReplySender(FakeFontCollection* collection)
+        : collection_(collection) {}
+
+    ~ReplySender();
+
+    scoped_ptr<IPC::Message>& OnMessageReceived(const IPC::Message& msg);
+
+    bool Send(IPC::Message* msg) override;
+
+   private:
+    void OnFindFamily(const base::string16& family_name, uint32* index);
+
+    void OnGetFamilyCount(uint32* count);
+
+    void OnGetFamilyNames(
+        uint32 family_index,
+        std::vector<std::pair<base::string16, base::string16>>* family_names);
+    void OnGetFontFiles(uint32 family_index,
+                        std::vector<base::string16>* file_paths_);
+
+   private:
+    scoped_refptr<FakeFontCollection> collection_;
+    scoped_ptr<IPC::Message> reply_;
+
+    DISALLOW_COPY_AND_ASSIGN(ReplySender);
+  };
+
+  // This class can be used by the "renderer" to send messages to the "browser"
+  class FakeSender : public IPC::Sender {
+   public:
+    FakeSender(FakeFontCollection* collection, bool track_messages)
+        : collection_(collection), track_messages_(track_messages) {}
+
+    ~FakeSender();
+
+    bool Send(IPC::Message* message) override;
+
+   private:
+    bool track_messages_;
+    scoped_refptr<FakeFontCollection> collection_;
+
+    DISALLOW_COPY_AND_ASSIGN(FakeSender);
+  };
+
+  void OnFindFamily(const base::string16& family_name, uint32* index);
+
+  void OnGetFamilyCount(uint32* count);
+
+  void OnGetFamilyNames(
+      uint32 family_index,
+      std::vector<std::pair<base::string16, base::string16>>* family_names);
+
+  void OnGetFontFiles(uint32 family_index,
+                      std::vector<base::string16>* file_paths);
+
+  std::unique_ptr<ReplySender> GetReplySender();
+
+ private:
+  friend class base::RefCounted<FakeFontCollection>;
+  ~FakeFontCollection();
+
+  std::vector<FakeFont> fonts_;
+  std::vector<std::unique_ptr<IPC::Message>> messages_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeFontCollection);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_DWRITE_FONT_FAKE_SENDER_WIN_H_