chromeos: implement persistence of proxy config to device, enhance unittest

- during storing, all info in proxy config is serialized into a dictionary and persisted to device via SignedSettings::StoragePropertyOp
- during retrieving, value is retrieved from device via SignedSettings::RetrievePropertyOp and deserialized into proxy config
- modify API to return bool when setting proxy config from UI
  - in DOMUI design, every interaction with the page triggers a call to update config in backend
  - but, sometimes, the info is incomplete, e.g. single-proxy checkbox is checked but proxy server is still empty
  - for such cases, config service caches the info (so that UI can get this info on the next Get), but doesn't activate or persist it, and returns false to UI
- wrote unittests for configuring socks proxy and bypass rules, serialize and deserialize, update unittest for code changes
- handle using stub implementation of libcros to make browser tests pass

BUG=chromium_os:5127
TEST=as owner, modify proxy config from UI, log out or reboot device, verify that proxy config is updated.

Review URL: http://codereview.chromium.org/3366028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@59772 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 0 deletions

diff --git a/chrome/test/in_process_browser_test.cc b/chrome/test/in_process_browser_test.cc
index 24242a4..57d43fde 100644
--- a/chrome/test/in_process_browser_test.cc
+++ b/chrome/test/in_process_browser_test.cc
@@ -64,6 +64,10 @@ class LinuxHostInit {
 }  // namespace
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/cros/cros_library.h"
+#endif  // defined(OS_CHROMEOS)
+
 extern int BrowserMain(const MainFunctionParams&);
 
 const wchar_t kUnitTestShowWindows[] = L"show-windows";
@@ -192,6 +196,10 @@ void InProcessBrowserTest::SetUp() {
   if (!tab_closeable_state_watcher_enabled_)
     command_line->AppendSwitch(switches::kDisableTabCloseableStateWatcher);
 
+#if defined(OS_CHROMEOS)
+  chromeos::CrosLibrary::Get()->GetTestApi()->SetUseStubImpl();
+#endif  // defined(OS_CHROMEOS)
+
   SandboxInitWrapper sandbox_wrapper;
   MainFunctionParams params(*command_line, sandbox_wrapper, NULL);
   params.ui_task =