Restore earlyouts in SignalTests on Windows for IPC flavour of the tests

content/browser/gpu/gpu_ipc_browsertests.cc

 // Copyright 2013 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 "base/command_line.h"
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
@@ skipping 12 matching lines @@
 
 using content::WebGraphicsContext3DCommandBufferImpl;
 
 const content::CauseForGpuLaunch kInitCause =
     content::
         CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE;
 
 class ContextTestBase : public content::ContentBrowserTest {
  public:
   void SetUpOnMainThread() override {
+    // This may leave the provider_ null in some cases, so tests need to early
+    // out.
     if (!content::BrowserGpuChannelHostFactory::CanUseForTesting())
       return;
 
     if (!content::BrowserGpuChannelHostFactory::instance())
       content::BrowserGpuChannelHostFactory::Initialize(true);
 
     content::BrowserGpuChannelHostFactory* factory =
         content::BrowserGpuChannelHostFactory::instance();
     CHECK(factory);
     base::RunLoop run_loop;
@@ skipping 21 matching lines @@
     ContentBrowserTest::SetUpOnMainThread();
   }
 
   void TearDownOnMainThread() override {
     // Must delete the context first.
     provider_ = nullptr;
     ContentBrowserTest::TearDownOnMainThread();
   }
 
  protected:
-  gpu::gles2::GLES2Interface* gl_;
-  gpu::ContextSupport* context_support_;
+  gpu::gles2::GLES2Interface* gl_ = nullptr;
+  gpu::ContextSupport* context_support_ = nullptr;
 
  private:
   scoped_refptr<content::ContextProviderCommandBuffer> provider_;
 };
 
 }  // namespace
 
 // Include the shared tests.
 #define CONTEXT_TEST_F IN_PROC_BROWSER_TEST_F
 #include "content/common/gpu/client/gpu_context_tests.h"
@@ skipping 193 matching lines @@
   shim->SimulateCrash();
   run_loop.Run();
 
   EXPECT_EQ(1, counter);
   EXPECT_FALSE(IsChannelEstablished());
   EstablishAndWait();
   EXPECT_TRUE(IsChannelEstablished());
 }
 
 }  // namespace content