alternate ntp: implement searchbox api for instant overlay to adopt themes

chrome/browser/instant/instant_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/instant/instant_controller.h"
 
 #include "base/command_line.h"
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
@@ skipping 547 matching lines @@
     loader_->OnActiveTabModeChanged(new_mode.is_ntp());
     // On navigation away from the NTP, hide custom content. However keep
     // the preview shown if searching, since it will soon show a suggestions
     // dropdown and hiding it would cause flicker.
     if (new_mode.is_default() &&
         model_.preview_state() == InstantModel::CUSTOM_NTP_CONTENT)
       Hide();
   }
 }
 
+void InstantController::OnThemeChanged(const ThemeBackgroundInfo& theme_info) {
+  if (loader_.get())
+    loader_->SendThemeBackgroundInfo(theme_info);
+}
+
+void InstantController::OnThemeAreaHeightChanged(int height) {
+  if (loader_.get())
+    loader_->SendThemeAreaHeight(height);
+}
+
 bool InstantController::commit_on_pointer_release() const {
   return GetPreviewContents() && loader_->IsPointerDownFromActivate();
 }
 
 void InstantController::SetSuggestions(
     InstantLoader* loader,
     const std::vector<InstantSuggestion>& suggestions) {
   if (loader_ != loader || model_.preview_state() == InstantModel::NOT_READY)
     return;
 
@@ skipping 111 matching lines @@
 
 void InstantController::ResetLoader(const std::string& instant_url,
                                     const TabContents* active_tab) {
   if (GetPreviewContents() && loader_->instant_url() != instant_url)
     DeleteLoader();
 
   if (!GetPreviewContents()) {
     loader_.reset(new InstantLoader(this, instant_url, active_tab));
     loader_->Init();
 
-    // Ensure the searchbox API has the correct focus state and context.
+    // Ensure the searchbox API has the correct focus state, context and theme-
+    // related info.
     if (is_omnibox_focused_)
       loader_->OnAutocompleteGotFocus();
     else
       loader_->OnAutocompleteLostFocus();
     loader_->OnActiveTabModeChanged(active_tab_mode_.is_ntp());
+    browser_->UpdateThemeRelatedInfoForPreview();
 
     // Reset the loader timer.
     stale_loader_timer_.Stop();
     stale_loader_timer_.Start(
         FROM_HERE,
         base::TimeDelta::FromMilliseconds(kStaleLoaderTimeoutMS), this,
         &InstantController::OnStaleLoader);
   }
 }
 
@@ skipping 147 matching lines @@
   }
 
   std::map<std::string, int>::const_iterator iter =
       blacklisted_urls_.find(*instant_url);
   if (iter != blacklisted_urls_.end() &&
       iter->second > kMaxInstantSupportFailures)
     return false;
 
   return true;
 }