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

base/base_paths_mac.mm

Index: base/base_paths_mac.mm
diff --git a/base/base_paths_mac.mm b/base/base_paths_mac.mm
index 56f3ecb9a91e9be5c8888e2f9e53fc04a4cbf64a..6f7f990330578fc1203fee742b92f0b93ddfec24 100644
--- a/base/base_paths_mac.mm
+++ b/base/base_paths_mac.mm
@@ -59,8 +59,16 @@ bool PathProviderMac(int key, FilePath* 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))