Update viewport_meta setting on any navigation.

content/test/test_render_view_host.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 "content/test/test_render_view_host.h"
 
 #include <memory>
 
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 221 matching lines @@
     RenderViewHostDelegate* delegate,
     int32_t main_frame_routing_id,
     bool swapped_out)
     : RenderViewHostImpl(instance,
                          std::move(widget),
                          delegate,
                          main_frame_routing_id,
                          swapped_out,
                          false /* has_initialized_audio_host */),
       delete_counter_(nullptr),
+      webkit_preferences_changed_counter_(nullptr),
       opener_frame_route_id_(MSG_ROUTING_NONE) {
   // TestRenderWidgetHostView installs itself into this->view_ in its
   // constructor, and deletes itself when TestRenderWidgetHostView::Destroy() is
   // called.
   new TestRenderWidgetHostView(GetWidget());
 }
 
 TestRenderViewHost::~TestRenderViewHost() {
   if (delete_counter_)
     ++*delete_counter_;
@@ skipping 35 matching lines @@
 }
 
 void TestRenderViewHost::SimulateWasShown() {
   GetWidget()->WasShown(ui::LatencyInfo());
 }
 
 WebPreferences TestRenderViewHost::TestComputeWebkitPrefs() {
   return ComputeWebkitPrefs();
 }
 
+void TestRenderViewHost::OnWebkitPreferencesChanged() {
+  RenderViewHostImpl::OnWebkitPreferencesChanged();
+  if (webkit_preferences_changed_counter_)
+    ++*webkit_preferences_changed_counter_;
+}
+
 void TestRenderViewHost::TestOnStartDragging(
     const DropData& drop_data) {
   blink::WebDragOperationsMask drag_operation = blink::WebDragOperationEvery;
   DragEventSourceInfo event_info;
   GetWidget()->OnStartDragging(drop_data, drag_operation, SkBitmap(),
                                gfx::Vector2d(), event_info);
 }
 
 void TestRenderViewHost::TestOnUpdateStateWithFile(
     const base::FilePath& file_path) {
@@ skipping 32 matching lines @@
 
 TestRenderFrameHost* RenderViewHostImplTestHarness::main_test_rfh() {
   return contents()->GetMainFrame();
 }
 
 TestWebContents* RenderViewHostImplTestHarness::contents() {
   return static_cast<TestWebContents*>(web_contents());
 }
 
 }  // namespace content