Add GL strings to CastSysInfo interface and use to configure GPU

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 4bdb4204a2c52a63cd41b87a5882320a07c6d06a..97a72745522203b26e1b80cba91c5719629a0b00 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -548,6 +548,9 @@ const char kForceTextBlobs[]                = "force-text-blobs";
 // Passes gpu device_id from browser process to GPU process.
 const char kGpuDeviceID[]                   = "gpu-device-id";
 
+// Passes gpu device_string from browser process to GPU process.
+const char kGpuDeviceString[]               = "gpu-device-string";
+
 // Passes gpu driver_vendor from browser process to GPU process.
 const char kGpuDriverVendor[]               = "gpu-driver-vendor";
 
@@ -576,6 +579,9 @@ const char kGpuStartupDialog[]              = "gpu-startup-dialog";
 // Passes gpu vendor_id from browser process to GPU process.
 const char kGpuVendorID[]                   = "gpu-vendor-id";
 
+// Passes gpu vendor_string from browser process to GPU process.
+const char kGpuVendorString[]               = "gpu-vendor-string";
+
 // These mappings only apply to the host resolver.
 const char kHostResolverRules[]             = "host-resolver-rules";