mac: Load the system hotkeys after launch. (reland)

content/browser/cocoa/system_hotkey_helper_mac.mm

Index: content/browser/cocoa/system_hotkey_helper_mac.mm
diff --git a/content/browser/cocoa/system_hotkey_helper_mac.mm b/content/browser/cocoa/system_hotkey_helper_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..68c52820ef36baffe6edbbb572c4ecf0d4a06dc0
--- /dev/null
+++ b/content/browser/cocoa/system_hotkey_helper_mac.mm
@@ -0,0 +1,77 @@
+// Copyright 2014 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/browser/cocoa/system_hotkey_helper_mac.h"
+
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/mac/foundation_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/metrics/histogram.h"
+#include "content/browser/cocoa/system_hotkey_map.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace {
+
+NSString* kSystemHotkeyPlistExtension =
+    @"/Preferences/com.apple.symbolichotkeys.plist";
+
+// Amount of time to delay loading the hotkeys in seconds.
+const int kLoadHotkeysDelaySeconds = 10;
+
+}  // namespace
+
+namespace content {
+
+// static
+SystemHotkeyHelperMac* SystemHotkeyHelperMac::GetInstance() {
+  return Singleton<SystemHotkeyHelperMac>::get();
+}
+
+void SystemHotkeyHelperMac::DeferredLoadSystemHotkeys() {
+  BrowserThread::PostDelayedTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(&SystemHotkeyHelperMac::LoadSystemHotkeys,
+                 base::Unretained(this)),
+      base::TimeDelta::FromSeconds(kLoadHotkeysDelaySeconds));
+}
+
+SystemHotkeyHelperMac::SystemHotkeyHelperMac() : map_(new SystemHotkeyMap) {
+}
+
+SystemHotkeyHelperMac::~SystemHotkeyHelperMac() {
+}
+
+void SystemHotkeyHelperMac::LoadSystemHotkeys() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+
+  std::string library_path(base::mac::GetUserLibraryPath().value());
+  NSString* expanded_file_path =
+      [NSString stringWithFormat:@"%s%@",
+                                 library_path.c_str(),
+                                 kSystemHotkeyPlistExtension];
+
+  // Loads the file into memory.
+  NSData* data = [NSData dataWithContentsOfFile:expanded_file_path];
+  // Intentionally create the object with +1 retain count, as FileDidLoad
+  // will destroy the object.
+  NSDictionary* dictionary = [SystemHotkeyMap::DictionaryFromData(data) retain];
+
+  BrowserThread::PostTask(BrowserThread::UI,
+                          FROM_HERE,
+                          base::Bind(&SystemHotkeyHelperMac::FileDidLoad,
+                                     base::Unretained(this),
+                                     dictionary));
+}
+
+void SystemHotkeyHelperMac::FileDidLoad(NSDictionary* dictionary) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  bool success = map()->ParseDictionary(dictionary);
+  UMA_HISTOGRAM_BOOLEAN("OSX.SystemHotkeyMap.LoadSuccess", success);
+  [dictionary release];
+}
+
+}  // namespace content