Propagate the result of AmountOfFreeSpace to JS and show it in chrome://drive-internals.

chrome/browser/ui/webui/chromeos/drive_internals_ui.cc

Index: chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc b/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
index 8a875624819598cf3791447dbaafcaa4189d0218..3a82a31e97533068883d9a360bea6dbc48c44432 100644
--- a/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
@@ -9,6 +9,8 @@
 #include "base/format_macros.h"
 #include "base/stringprintf.h"
 #include "base/memory/weak_ptr.h"
+#include "base/path_service.h"
+#include "base/sys_info.h"
 #include "chrome/browser/chromeos/gdata/gdata.pb.h"
 #include "chrome/browser/chromeos/gdata/gdata_auth_service.h"
 #include "chrome/browser/chromeos/gdata/gdata_cache.h"
@@ -215,6 +217,20 @@ void DriveInternalsWebUIHandler::OnPageLoaded(const base::ListValue* args) {
                          documents_service->HasAccessToken());
   web_ui()->CallJavascriptFunction("updateAuthStatus", auth_status);
 
+  // Propagate the amount of local free space in bytes.
+  FilePath path;
+  int64 free_space = -1;
+  if (PathService::Get(base::DIR_HOME, &path)) {
+    free_space = base::SysInfo::AmountOfFreeDiskSpace(path);

[satorux1, 2012/08/13 07:26:20]

I think we shouldn't do this on UI thread. We should post a task to a blocking
pool. Please see some example in chrome/browser/chromeos/gdata.

Looking at the code, AmountOfFreeDiskSpace does not have 

  base::ThreadRestrictions::AssertIOAllowed();

I think we should add it, as it'll likely access the disk. Could you add it in a
separate patch?

[Haruki Sato, 2012/08/17 05:46:34]

Done.
and moved the code to have more cleaner structure.
PTAL.

Also I filed http://crbug.com/143335 and will work on it.

+  } else {
+    LOG(ERROR) << "Home directory not found";
+  }
+  base::DictionaryValue local_storage_summary;
+  local_storage_summary.SetDouble("free_space", free_space);
+  web_ui()->CallJavascriptFunction(
+      "updateLocalStorageUsage", local_storage_summary);
+
+
   // Start updating the GCache contents section.
   Profile* profile = Profile::FromWebUI(web_ui());
   const FilePath root_path =