Added UI for clearing Chrome Sync data

- Created 2 tabs, one for for clearing local browsing data, one for clearing server data
- Refactored the old local browsing code to use a grid layout rather than less-wieldy math
- Controls on all tabs block while, closing dialog is disabled, new throbber is going while clear is in progress
- Clear server tab will be behind a flag until I deploy the server endpoint
- Retained old clearing behavior: dialog closes on successful lear
- Clear server UI only visible if user is syncing

Outstanding issues:
- Clearing currently causes an account to become unusable.  The cause of the issue is a known problem with auth; currently investigating a fix
- Unlike local clearing, clearing server data is more likely to error out.  For now I just show a label next to the clear button that says Error, allowing the user to try again

BUG=54349
TEST=Clear from UI, or run sync backend tests checked in for issue 54280

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=60845

Review URL: http://codereview.chromium.org/3412032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60980 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 0 deletions

diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 639d42b..4d9d14f 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -381,6 +381,10 @@ const char kEnableBenchmarking[]            = "enable-benchmarking";
 // Chromoting Host Process within the service process.
 const char kEnableRemoting[]                = "enable-remoting";
 
+// This flag enables UI for clearing server data.  Temporarily in place
+// until there's a server endpoint deployed.
+const char kEnableClearServerData[]         = "enable-clear-server-data";
+
 // This applies only when the process type is "service". Enables the
 // Cloud Print Proxy component within the service process.
 const char kEnableCloudPrintProxy[]         = "enable-cloud-print-proxy";