Instant: Use only one hidden WebContents per profile.

chrome/browser/ui/views/frame/instant_overlay_controller_views.cc

+// Copyright 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/ui/views/frame/instant_overlay_controller_views.h"
+
+#include "chrome/browser/instant/instant_model.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/view_ids.h"
+#include "chrome/browser/ui/views/frame/browser_view.h"
+#include "chrome/browser/ui/views/frame/contents_container.h"
+#include "chrome/browser/ui/views/infobars/infobar_container_view.h"
+#include "ui/views/controls/webview/webview.h"
+
+InstantOverlayControllerViews::InstantOverlayControllerViews(
+    Browser* browser,
+    ContentsContainer* contents)
+    : InstantOverlayController(browser),
+      contents_(contents) {
+}
+
+InstantOverlayControllerViews::~InstantOverlayControllerViews() {
+}
+
+void InstantOverlayControllerViews::OverlayStateChanged(
+    const InstantModel& model) {
+  if (model.overlay()) {
+    // Show the overlay.
+    if (!overlay_) {
+      overlay_.reset(new views::WebView(browser_->profile()));
+      overlay_->set_id(VIEW_ID_TAB_CONTAINER);
+    }
+    // Drop shadow is only needed if the overlay does not fill up the entire
+    // contents page.
+    bool draw_drop_shadow = !contents_->IsOverlayFullHeight(
+        model.height(), model.is_height_in_pixels());
+    contents_->SetOverlay(overlay_.get(), model.overlay(), model.height(),
+        model.is_height_in_pixels(), draw_drop_shadow);
+    overlay_->SetWebContents(model.overlay());
+    browser_->MaybeUpdateBookmarkBarStateForInstantOverlay();
+  } else if (overlay_) {
+    // Hide the overlay. SetWebContents() must happen before SetOverlay().
+    overlay_->SetWebContents(NULL);
+    contents_->SetOverlay(NULL, NULL, 0, false, false);
+    overlay_.reset();
+  }
+
+  // If an Instant overlay is added during an immersive mode reveal, the reveal
+  // view needs to stay on top.
+  // Notify infobar container of change in overlay state.
+  if (overlay_) {
+    BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser_);
+    if (browser_view) {
+      browser_view->MaybeStackImmersiveRevealAtTop();
+      browser_view->infobar_container()->OverlayStateChanged(model);
+    }
+  }
+}