Why this CL triggers an OilPan crash.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 252 matching lines @@
     graphics_context.FillRect(rect, color_);
   }
 
   WebColor color_;
 };
 
 }  // namespace
 
 // WebView ----------------------------------------------------------------
 
+static_assert(
+    Page::kUnknownBrowsingInstance == WebView::kUnknownBrowsingInstance,
+    "Constants should have the same value in blink's web and core layers");
+
 WebView* WebView::Create(WebViewClient* client,
-                         WebPageVisibilityState visibility_state) {
-  return WebViewImpl::Create(client, visibility_state);
+                         WebPageVisibilityState visibility_state,
+                         int browsing_instance_id) {
+  return WebViewImpl::Create(client, visibility_state, browsing_instance_id);
 }
 
 WebViewBase* WebViewImpl::Create(WebViewClient* client,
-                                 WebPageVisibilityState visibility_state) {
+                                 WebPageVisibilityState visibility_state,
+                                 int browsing_instance_id) {
   // Pass the WebViewImpl's self-reference to the caller.
-  return AdoptRef(new WebViewImpl(client, visibility_state)).LeakRef();
+  return AdoptRef(
+             new WebViewImpl(client, visibility_state, browsing_instance_id))
+      .LeakRef();
 }
 
 const WebInputEvent* WebViewBase::CurrentInputEvent() {
   return WebViewImpl::CurrentInputEvent();
 }
 
 void WebView::SetUseExternalPopupMenus(bool use_external_popup_menus) {
   g_should_use_external_popup_menus = use_external_popup_menus;
 }
 
@@ skipping 36 matching lines @@
   spell_check_client_ = spell_check_client;
 }
 
 // static
 HashSet<WebViewBase*>& WebViewBase::AllInstances() {
   DEFINE_STATIC_LOCAL(HashSet<WebViewBase*>, all_instances, ());
   return all_instances;
 }
 
 WebViewImpl::WebViewImpl(WebViewClient* client,
-                         WebPageVisibilityState visibility_state)
+                         WebPageVisibilityState visibility_state,
+                         int browsing_instance_id)
     : client_(client),
       spell_check_client_(nullptr),
       chrome_client_impl_(ChromeClientImpl::Create(this)),
       context_menu_client_impl_(this),
       editor_client_impl_(this),
       spell_checker_client_impl_(this),
       storage_client_impl_(this),
       should_auto_resize_(false),
       zoom_level_(0),
       minimum_zoom_level_(ZoomFactorToZoomLevel(kMinTextSizeMultiplier)),
@@ skipping 36 matching lines @@
                                      ->CreateWebViewScheduler(this, this)
                                      .release())),
       last_frame_time_monotonic_(0),
       override_compositor_visibility_(false) {
   Page::PageClients page_clients;
   page_clients.chrome_client = chrome_client_impl_.Get();
   page_clients.context_menu_client = &context_menu_client_impl_;
   page_clients.editor_client = &editor_client_impl_;
   page_clients.spell_checker_client = &spell_checker_client_impl_;
 
-  page_ = Page::CreateOrdinary(page_clients);
+  page_ = Page::CreateOrdinary(page_clients, browsing_instance_id);
   MediaKeysController::ProvideMediaKeysTo(*page_, &media_keys_client_impl_);
   ProvideSpeechRecognitionTo(
       *page_, SpeechRecognitionClientProxy::Create(
                   client ? client->SpeechRecognizer() : nullptr));
   ProvideContextFeaturesTo(*page_, ContextFeaturesClientImpl::Create());
   ProvideDatabaseClientTo(*page_, new DatabaseClient);
 
   ProvideStorageQuotaClientTo(*page_, StorageQuotaClientImpl::Create());
   page_->SetValidationMessageClient(ValidationMessageClientImpl::Create(*this));
   ProvideDedicatedWorkerMessagingProxyProviderTo(
@@ skipping 3763 matching lines @@
   if (focused_frame->LocalFrameRoot() != MainFrameImpl()->GetFrame())
     return nullptr;
   return focused_frame;
 }
 
 LocalFrame* WebViewImpl::FocusedLocalFrameAvailableForIme() const {
   return ime_accept_events_ ? FocusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink