mac: ensure ui::Compositor exists for visible RWHVs

content/public/test/test_renderer_host.cc

Index: content/public/test/test_renderer_host.cc
diff --git a/content/public/test/test_renderer_host.cc b/content/public/test/test_renderer_host.cc
index e9e41ab06921b2fd39dc8a11e7be8b63eff51e6d..a7ff602e3653a3139832b0ea55c51be3b4e9f53e 100644
--- a/content/public/test/test_renderer_host.cc
+++ b/content/public/test/test_renderer_host.cc
@@ -38,6 +38,10 @@
 #include "ui/wm/core/default_activation_client.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
+#endif
+
 namespace content {
 
 // RenderFrameHostTester ------------------------------------------------------
@@ -214,6 +218,11 @@ void RenderViewHostTestHarness::SetUp() {
 
   if (IsBrowserSideNavigationEnabled())
     BrowserSideNavigationSetUp();
+
+#if defined(OS_MACOSX)
+  ui::WindowResizeHelperMac::Get()->Init(
+    base::MessageLoop::current()->task_runner());
+#endif  // OS_MACOSX
 }
 
 void RenderViewHostTestHarness::TearDown() {
@@ -229,6 +238,10 @@ void RenderViewHostTestHarness::TearDown() {
   // before we destroy the browser context.
   base::RunLoop().RunUntilIdle();
 
+#if defined(OS_MACOSX)
+  ui::WindowResizeHelperMac::Get()->ShutdownForTests();
+#endif  // OS_MACOSX
+
 #if defined(OS_WIN)
   ole_initializer_.reset();
 #endif