Implement kCurrentThemeID so we can know what the last theme to be installed ...

chrome/browser/profile.cc

Index: chrome/browser/profile.cc
===================================================================
--- chrome/browser/profile.cc	(revision 22263)
+++ chrome/browser/profile.cc	(working copy)
@@ -126,7 +126,8 @@
 #if defined(OS_LINUX)
   prefs->RegisterBooleanPref(prefs::kUsesSystemTheme, false);
 #endif
-  prefs->RegisterStringPref(prefs::kCurrentThemeID, L"");
+  prefs->RegisterStringPref(prefs::kCurrentThemeID,
+                            UTF8ToWide(BrowserThemeProvider::kDefaultThemeID));
   prefs->RegisterDictionaryPref(prefs::kCurrentThemeImages);
   prefs->RegisterDictionaryPref(prefs::kCurrentThemeColors);
   prefs->RegisterDictionaryPref(prefs::kCurrentThemeTints);
@@ -309,6 +310,10 @@
     GetOriginalProfile()->ClearTheme();
   }
 
+  virtual Extension* GetTheme() {
+    return GetOriginalProfile()->GetTheme();
+  }
+
   virtual ThemeProvider* GetThemeProvider() {
     return GetOriginalProfile()->GetThemeProvider();
   }
@@ -980,6 +985,16 @@
   theme_provider_.get()->UseDefaultTheme();
 }
 
+Extension* ProfileImpl::GetTheme() {
+  InitThemes();
+
+  std::string id = theme_provider_.get()->GetThemeID();
+  if (id == BrowserThemeProvider::kDefaultThemeID)
+    return NULL;
+
+  return extensions_service_->GetExtensionById(id);
+}
+
 ThemeProvider* ProfileImpl::GetThemeProvider() {
   InitThemes();
   return theme_provider_.get();