Fail gracefully if profile Temp dir can not be accessed.

chrome/browser/extensions/sandboxed_extension_unpacker.h

Index: chrome/browser/extensions/sandboxed_extension_unpacker.h
diff --git a/chrome/browser/extensions/sandboxed_extension_unpacker.h b/chrome/browser/extensions/sandboxed_extension_unpacker.h
index e47b26c513abe87fe844ad601e40337296850d2b..5640d773f4562f81f3114da28732b302584cf103 100644
--- a/chrome/browser/extensions/sandboxed_extension_unpacker.h
+++ b/chrome/browser/extensions/sandboxed_extension_unpacker.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -93,7 +93,6 @@ class SandboxedExtensionUnpacker : public UtilityProcessHost::Client {
   // |client| with the result. If |rdh| is provided, unpacking is done in a
   // sandboxed subprocess. Otherwise, it is done in-process.
   SandboxedExtensionUnpacker(const FilePath& crx_path,
-                             const FilePath& temp_path,
                              ResourceDispatcherHost* rdh,
                              SandboxedExtensionUnpackerClient* cilent);
 
@@ -104,9 +103,18 @@ class SandboxedExtensionUnpacker : public UtilityProcessHost::Client {
   class ProcessHostClient;
   friend class ProcessHostClient;
   friend class SandboxedExtensionUnpackerTest;
+  FRIEND_TEST_ALL_PREFIXES(SandboxedExtensionUnpackerTest,
+                           CreateTempDirectory);
 
   virtual ~SandboxedExtensionUnpacker();
 
+  // Creatye a temporary directory to unpack the extension in.
+  // |unpack_path_keys| is a list of PathService keys in which
+  // to place the unpack directory.  A list is used in case some
+  // directories are not writable for any reason.
+  virtual bool CreateTempDirectory(const int unpack_path_keys[],
+                                   size_t unpack_path_keys_size);
+
   // Validates the signature of the extension and extract the key to
   // |public_key_|. Returns true if the signature validates, false otherwise.
   //
@@ -141,9 +149,6 @@ class SandboxedExtensionUnpacker : public UtilityProcessHost::Client {
   // The path to the CRX to unpack.
   FilePath crx_path_;
 
-  // A path to a temp dir to unpack in.
-  FilePath temp_path_;
-
   // Our client's thread. This is the thread we respond on.
   BrowserThread::ID thread_identifier_;