Ignore gpu blacklists with kOverrideUseGLWithOSMesaForTests.

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 <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 507 matching lines @@
   const bool force_osmesa =
       (command_line->GetSwitchValueASCII(switches::kUseGL) ==
        gl::kGLImplementationOSMesaName) ||
       command_line->HasSwitch(switches::kOverrideUseGLWithOSMesaForTests);
   if (force_osmesa) {
     // If using the OSMesa GL implementation, use fake vendor and device ids to
     // make sure it never gets blacklisted. This is better than simply
     // cancelling GPUInfo gathering as it allows us to proceed with loading the
     // blacklist below which may have non-device specific entries we want to
     // apply anyways (e.g., OS version blacklisting).
     gpu_info.gpu.vendor_id = 0xffff;

[danakj, 2016/08/13 02:14:57]

Do these not work? Do you get why?

[sadrul, 2016/08/13 02:58:45]

Because of this entry in the gpu blacklist:
https://cs.chromium.org/chromium/src/gpu/config/software_rendering_list_json....

     gpu_info.gpu.device_id = 0xffff;
 
     // Also declare the driver_vendor to be osmesa to be able to specify
     // exceptions based on driver_vendor==osmesa for some blacklist rules.
     gpu_info.driver_vendor = gl::kGLImplementationOSMesaName;
 
     // We are not going to call CollectBasicGraphicsInfo.
     // So mark it as collected.
     gpu_info.basic_info_state = gpu::kCollectInfoSuccess;
   } else {
@@ skipping 29 matching lines @@
   if (!gpu_info.gpu.vendor_id || !gpu_info.gpu.device_id) {
     gpu_info.context_info_state = gpu::kCollectInfoNonFatalFailure;
 #if defined(OS_WIN)
     gpu_info.dx_diagnostics_info_state = gpu::kCollectInfoNonFatalFailure;
 #endif  // OS_WIN
   }
 #endif  // ARCH_CPU_X86_FAMILY
 
   std::string gpu_blacklist_string;
   std::string gpu_driver_bug_list_string;
-  if (!command_line->HasSwitch(switches::kIgnoreGpuBlacklist) &&
+  if (!force_osmesa &&
+      !command_line->HasSwitch(switches::kIgnoreGpuBlacklist) &&
       !command_line->HasSwitch(switches::kUseGpuInTests)) {
     gpu_blacklist_string = gpu::kSoftwareRenderingListJson;
   }
-  if (!command_line->HasSwitch(switches::kDisableGpuDriverBugWorkarounds)) {
+  if (!force_osmesa &&
+      !command_line->HasSwitch(switches::kDisableGpuDriverBugWorkarounds)) {
     gpu_driver_bug_list_string = gpu::kGpuDriverBugListJson;
   }
   InitializeImpl(gpu_blacklist_string,
                  gpu_driver_bug_list_string,
                  gpu_info);
 
   if (command_line->HasSwitch(switches::kSingleProcess) ||
       command_line->HasSwitch(switches::kInProcessGPU)) {
     command_line->AppendSwitch(switches::kDisableGpuWatchdog);
     AppendGpuCommandLine(command_line, nullptr);
@@ skipping 704 matching lines @@
   gpu_info_.context_info_state = gpu::kCollectInfoFatalFailure;
 #if defined(OS_WIN)
   gpu_info_.dx_diagnostics_info_state = gpu::kCollectInfoFatalFailure;
 #endif
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content