Always enable FCM on Windows.

content/browser/gpu/gpu_data_manager_impl_private.cc

 // Copyright (c) 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 "content/browser/gpu/gpu_data_manager_impl_private.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 538 matching lines @@
                                              std::string* gl_version) {
   DCHECK(gl_vendor && gl_renderer && gl_version);
 
   *gl_vendor = gpu_info_.gl_vendor;
   *gl_renderer = gpu_info_.gl_renderer;
   *gl_version = gpu_info_.gl_version_string;
 }
 
 void GpuDataManagerImplPrivate::Initialize() {
   TRACE_EVENT0("startup", "GpuDataManagerImpl::Initialize");
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kSkipGpuDataLoading) &&
-      !command_line->HasSwitch(switches::kUseGpuInTests))
-    return;
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
 
   gpu::GPUInfo gpu_info;
-  {
+  if (command_line->GetSwitchValueASCII(
+          switches::kUseGL) == gfx::kGLImplementationOSMesaName) {
+    // If using the OSMesa GL implementation, report fake vendor and device
+    // names.
+    gpu_info.gpu.vendor_string = gfx::kGLImplementationOSMesaName;

[Zhenyao Mo, 2013/08/16 16:59:01]

Actually you don't have to fake these data.  The only data you need to supply so
the blacklist logic don't think the GPUInfo is empty is the gpu.vendor_id and
gpu.device_id.  You probably can set both to 0x9999, which I don't think will be
conflicting with any real vendor/device.

[gab, 2013/08/16 17:04:46]

Ah ok, good to know, why is that? (it's not clear to me why that is so I'd like
to know so I can add a comment here for any future reader of this code).

[gab, 2013/08/16 19:42:16]

Done.

+    gpu_info.gpu.device_string = gfx::kGLImplementationOSMesaName;
+    gpu_info.driver_vendor = gfx::kGLImplementationOSMesaName;
+    gpu_info.driver_date = "8-16-2013";
+    gpu_info.gl_vendor = gfx::kGLImplementationOSMesaName;
+    gpu_info.gl_renderer = gfx::kGLImplementationOSMesaName;
+  } else {
     TRACE_EVENT0("startup",
       "GpuDataManagerImpl::Initialize:CollectBasicGraphicsInfo");
     gpu::CollectBasicGraphicsInfo(&gpu_info);
   }
 #if defined(ARCH_CPU_X86_FAMILY)
   if (!gpu_info.gpu.vendor_id || !gpu_info.gpu.device_id)
     gpu_info.finalized = true;
 #endif
 
   std::string gpu_blacklist_string;
@@ skipping 669 matching lines @@
 void GpuDataManagerImplPrivate::OnGpuProcessInitFailure() {
   gpu_process_accessible_ = false;
   gpu_info_.finalized = true;
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content