Enable GPU blacklist in tests.

content/browser/gpu/gpu_data_manager_impl_private.cc

Index: content/browser/gpu/gpu_data_manager_impl_private.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private.cc b/content/browser/gpu/gpu_data_manager_impl_private.cc
index 2a82137a58a52c90a690891f13b78e92af68e3a8..e90feafab079d5ccb33647d0063bcae394942263 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private.cc
@@ -332,6 +332,9 @@ void GpuDataManagerImplPrivate::InitializeForTesting(
   // This function is for testing only, so disable histograms.
   update_histograms_ = false;
 
+  // Prevent all further initialization.
+  finalized_ = true;
+
   InitializeImpl(gpu_blacklist_json, std::string(), std::string(), gpu_info);
 }
 
@@ -545,13 +548,35 @@ void GpuDataManagerImplPrivate::GetGLStrings(std::string* gl_vendor,
 
 void GpuDataManagerImplPrivate::Initialize() {
   TRACE_EVENT0("startup", "GpuDataManagerImpl::Initialize");
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kSkipGpuDataLoading) &&
-      !command_line->HasSwitch(switches::kUseGpuInTests))
+  if (finalized_) {
+    DLOG(INFO) << "GpuDataManagerImpl marked as finalized; skipping Initialize";
+    return;
+  }
+
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kSkipGpuDataLoading))
     return;
 
   gpu::GPUInfo gpu_info;
-  {
+  if (command_line->GetSwitchValueASCII(
+          switches::kUseGL) == gfx::kGLImplementationOSMesaName) {
+    // 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;
+    gpu_info.gpu.device_id = 0xffff;
+
+    // Hardcode some values otherwise some blacklisting rules in
+    // kSoftwareRenderingListJson result in a positive match as GpuControlList
+    // assumes a match (by design) when a property is required for the
+    // verification yet not present in the GpuInfo.
+    gpu_info.driver_vendor =
+        gfx::kGLImplementationOSMesaName;  // Bypass rule #74.
+    gpu_info.driver_date = "2013.8";  // Bypass rules #12 and #55.
+    gpu_info.driver_version = "9.0.3";  // Bypass rule #23.
+  } else {
     TRACE_EVENT0("startup",
       "GpuDataManagerImpl::Initialize:CollectBasicGraphicsInfo");
     gpu::CollectBasicGraphicsInfo(&gpu_info);
@@ -985,7 +1010,8 @@ GpuDataManagerImplPrivate::GpuDataManagerImplPrivate(
       owner_(owner),
       display_count_(0),
       gpu_process_accessible_(true),
-      use_software_compositor_(false) {
+      use_software_compositor_(false),
+      finalized_(false) {
   DCHECK(owner_);
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kDisableAcceleratedCompositing)) {
@@ -1032,6 +1058,10 @@ void GpuDataManagerImplPrivate::InitializeImpl(
 
   if (!gpu_blacklist_json.empty()) {
     gpu_blacklist_.reset(gpu::GpuBlacklist::Create());
+    if (CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kLogGpuControlListDecisions)) {
+      gpu_blacklist_->enable_control_list_logging();
+    }
     gpu_blacklist_->LoadList(
         browser_version_string, gpu_blacklist_json,
         gpu::GpuControlList::kCurrentOsOnly);