Add missing TaskScheduler on tests using RendereWidgetHostImpl

content/browser/renderer_host/text_input_client_mac_unittest.mm

Index: content/browser/renderer_host/text_input_client_mac_unittest.mm
diff --git a/content/browser/renderer_host/text_input_client_mac_unittest.mm b/content/browser/renderer_host/text_input_client_mac_unittest.mm
index ac50233e1993471886b4fbad9f217c03ed9c1232..3bb9df5cab2da2191b84628a2e2ea52a471c1697 100644
--- a/content/browser/renderer_host/text_input_client_mac_unittest.mm
+++ b/content/browser/renderer_host/text_input_client_mac_unittest.mm
@@ -9,7 +9,9 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/scoped_task_scheduler.h"
 #include "base/threading/thread.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
@@ -45,7 +47,8 @@ class MockRenderWidgetHostDelegate : public RenderWidgetHostDelegate {
 class TextInputClientMacTest : public testing::Test {
  public:
   TextInputClientMacTest()
-      : browser_context_(),
+      : task_scheduler_(&message_loop_),
+        browser_context_(),
         process_factory_(),
         delegate_(),
         thread_("TextInputClientMacTestThread") {
@@ -55,6 +58,15 @@ class TextInputClientMacTest : public testing::Test {
     widget_.reset(new RenderWidgetHostImpl(&delegate_, rph, routing_id, false));
   }
 
+  void TearDown() override {
+    // |widget_| needs to be cleared before flushing the message loop, otherwise
+    // |widgets_|'s destructor calls MockRenderProcessHost::Cleanup, it
+    // schedules the MRPH deletion, and then MockRenderProcessHostFactory also
+    // deletes the MRPH before scheduled MRPH deletion is invoked.

[kinuko, 2017/03/31 14:26:55]

Whoa.

+    widget_.reset();
+    base::RunLoop().RunUntilIdle();
+  }
+
   // Accessor for the TextInputClientMac instance.
   TextInputClientMac* service() {
     return TextInputClientMac::GetInstance();
@@ -83,6 +95,10 @@ class TextInputClientMacTest : public testing::Test {
   friend class ScopedTestingThread;
 
   base::MessageLoopForUI message_loop_;
+
+  // TaskScheduler is used by RenderWidgetHostImpl constructor.
+  base::test::ScopedTaskScheduler task_scheduler_;
+
   TestBrowserContext browser_context_;
 
   // Gets deleted when the last RWH in the "process" gets destroyed.