Add an iOS implementation for base::PathService::Get() with path key DIR_APP_DATA.

base/base_paths_mac.mm

 // Copyright (c) 2012 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 "base/base_paths_mac.h"
 
 #include <dlfcn.h>
 #import <Foundation/Foundation.h>
 #include <mach-o/dyld.h>
 
@@ skipping 41 matching lines @@
 bool PathProviderMac(int key, FilePath* result) {
   switch (key) {
     case base::FILE_EXE:
       GetNSExecutablePath(result);
       return true;
     case base::FILE_MODULE:
       return GetModulePathForAddress(result,
           reinterpret_cast<const void*>(&base::PathProviderMac));
     case base::DIR_CACHE:
       return base::mac::GetUserDirectory(NSCachesDirectory, result);
-    case base::DIR_APP_DATA:
-      return base::mac::GetUserDirectory(NSApplicationSupportDirectory, result);
+    case base::DIR_APP_DATA: {
+      // On IOS, this directory does not exist unless it is created explicitly.

[rohitrao (ping after 24h), 2012/07/25 14:45:51]

This comment should move down inside the OS_IOS block.

+      bool success = base::mac::GetUserDirectory(NSApplicationSupportDirectory,
+                                                 result);
+#if defined(OS_IOS)
+      if (success && !file_util::PathExists(*result))
+        success = file_util::CreateDirectory(*result);
+#endif  // defined(OS_IOS)
+      return success;
+    }
     case base::DIR_SOURCE_ROOT: {
       // Go through PathService to catch overrides.
       if (!PathService::Get(base::FILE_EXE, result))
         return false;
 
       // Start with the executable's directory.
       *result = result->DirName();
 
 #if !defined(OS_IOS)
       if (base::mac::AmIBundled()) {
         // The bundled app executables (Chromium, TestShell, etc) live five
         // levels down, eg:
         // src/xcodebuild/{Debug|Release}/Chromium.app/Contents/MacOS/Chromium
         *result = result->DirName().DirName().DirName().DirName().DirName();
       } else {
         // Unit tests execute two levels deep from the source root, eg:
         // src/xcodebuild/{Debug|Release}/base_unittests
         *result = result->DirName().DirName();
       }
 #endif
       return true;
     }
     default:
       return false;
   }
 }
 
 }  // namespace base