Add flag to force complex text for tests

content/shell/renderer/layout_test/layout_test_render_process_observer.cc

 // Copyright (c) 2014 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/shell/renderer/layout_test/layout_test_render_process_observer.h"
 
 #include "base/command_line.h"
 #include "components/test_runner/web_test_interfaces.h"
 #include "content/public/common/content_client.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 57 matching lines @@
           switches::kStableReleaseMode)) {
     WebRuntimeFeatures::enableTestOnlyFeatures(true);
   }
 
   test_interfaces_.reset(new test_runner::WebTestInterfaces);
   test_interfaces_->ResetAll();
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableFontAntialiasing)) {
     blink::setFontAntialiasingEnabledForTest(true);
   }
-
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAlwaysUseComplexText)) {
+    blink::setAlwaysUseComplexTextForTest(true);
+  }
 }
 
 void LayoutTestRenderProcessObserver::OnRenderProcessShutdown() {
   test_interfaces_.reset();
 }
 
 bool LayoutTestRenderProcessObserver::OnControlMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(LayoutTestRenderProcessObserver, message)
     IPC_MESSAGE_HANDLER(ShellViewMsg_SetWebKitSourceDir, OnSetWebKitSourceDir)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 void LayoutTestRenderProcessObserver::OnSetWebKitSourceDir(
     const base::FilePath& webkit_source_dir) {
   webkit_source_dir_ = webkit_source_dir;
 }
 
 }  // namespace content