[Extensions] Make extension message bubble factory platform-abstract

chrome/browser/extensions/settings_api_bubble_controller.cc

Index: chrome/browser/extensions/settings_api_bubble_controller.cc
diff --git a/chrome/browser/extensions/settings_api_bubble_controller.cc b/chrome/browser/extensions/settings_api_bubble_controller.cc
index e89f42f129033152457ea5d93a2587c2347aeaa3..e90cf936acd09c2c5ba26e269dabe57a4f5e464b 100644
--- a/chrome/browser/extensions/settings_api_bubble_controller.cc
+++ b/chrome/browser/extensions/settings_api_bubble_controller.cc
@@ -54,6 +54,7 @@ class SettingsApiBubbleDelegate
   base::string16 GetActionButtonLabel() const override;
   base::string16 GetDismissButtonLabel() const override;
   bool ShouldShowExtensionList() const override;
+  bool ShouldHighlightExtensions() const override;
   void LogExtensionCount(size_t count) override;
   void LogAction(
       ExtensionMessageBubbleController::BubbleAction action) override;
@@ -244,6 +245,10 @@ bool SettingsApiBubbleDelegate::ShouldShowExtensionList() const {
   return false;
 }
 
+bool SettingsApiBubbleDelegate::ShouldHighlightExtensions() const {
+  return type_ == BUBBLE_TYPE_STARTUP_PAGES;
+}
+
 void SettingsApiBubbleDelegate::LogExtensionCount(size_t count) {
 }
 
@@ -290,11 +295,27 @@ SettingsApiBubbleController::SettingsApiBubbleController(
 
 SettingsApiBubbleController::~SettingsApiBubbleController() {}
 
-bool SettingsApiBubbleController::ShouldShow(const std::string& extension_id) {
-  if (delegate()->HasBubbleInfoBeenAcknowledged(extension_id))
+bool SettingsApiBubbleController::ShouldShow() {
+  const Extension* extension = nullptr;
+  switch (type_) {
+    case BUBBLE_TYPE_HOME_PAGE:
+      extension = GetExtensionOverridingHomepage(profile_);
+      break;
+    case BUBBLE_TYPE_SEARCH_ENGINE:
+      extension = GetExtensionOverridingSearchEngine(profile_);
+      break;
+    case BUBBLE_TYPE_STARTUP_PAGES:
+      extension = GetExtensionOverridingStartupPages(profile_);
+      break;
+  }
+
+  if (!extension)
+    return false;
+
+  if (delegate()->HasBubbleInfoBeenAcknowledged(extension->id()))
     return false;
 
-  if (!delegate()->ShouldIncludeExtension(extension_id))
+  if (!delegate()->ShouldIncludeExtension(extension->id()))
     return false;
 
   // If the browser is showing the 'Chrome crashed' infobar, it won't be showing