Add an extension bubble explaining which extensions are in dev mode.

chrome/browser/ui/views/toolbar/browser_action_view.cc

Index: chrome/browser/ui/views/toolbar/browser_action_view.cc
diff --git a/chrome/browser/ui/views/toolbar/browser_action_view.cc b/chrome/browser/ui/views/toolbar/browser_action_view.cc
index f64f0e8538ead65992ec204b685975cea9f19e5a..1c91cbb2dd797b64c31641cc9f8017a7f6490ad8 100644
--- a/chrome/browser/ui/views/toolbar/browser_action_view.cc
+++ b/chrome/browser/ui/views/toolbar/browser_action_view.cc
@@ -7,9 +7,11 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/commands/command_service.h"
+#include "chrome/browser/extensions/dev_mode_bubble_controller.h"
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_context_menu_model.h"
+#include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
@@ -238,7 +240,21 @@ void BrowserActionButton::UpdateState() {
     ThemeService* theme =
         ThemeServiceFactory::GetForProfile(browser_->profile());
 
-    gfx::ImageSkia bg = *theme->GetImageSkiaNamed(IDR_BROWSER_ACTION);
+    int background_id = IDR_BROWSER_ACTION;
+    if (extension_->IsDevModeExtension()) {
+      // We only want to call out dev mode extensions while the bubble is up.
+      extensions::DevModeBubbleController* dev_mode_extensions =
+          extensions::DevModeBubbleController::Get(
+              browser_->profile());
+      if (dev_mode_extensions->showing_bubble()) {
+        ExtensionService* service = extensions::ExtensionSystem::Get(
+            browser_->profile())->extension_service();
+        extensions::ExtensionPrefs* prefs = service->extension_prefs();
+        if (!prefs->HasDevModeBeenAcknowledged(extension_->id()))
+          background_id = IDR_BROWSER_ACTION_HIGHLIGHT;
+      }
+    }
+    gfx::ImageSkia bg = *theme->GetImageSkiaNamed(background_id);
     SetIcon(gfx::ImageSkiaOperations::CreateSuperimposedImage(bg, icon));
 
     gfx::ImageSkia bg_h = *theme->GetImageSkiaNamed(IDR_BROWSER_ACTION_H);