Add GL strings to CastSysInfo interface and use to configure GPU

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index ae8a2c6d1bdd2a72587e3beaad5f6c7589935d2d..abcd956c1fe79d19f795e3219530ca2a85392694 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -154,6 +154,7 @@ CONTENT_EXPORT extern const char kForceGpuRasterization[];
 CONTENT_EXPORT extern const char kForceRendererAccessibility[];
 CONTENT_EXPORT extern const char kForceTextBlobs[];
 extern const char kGpuDeviceID[];
+extern const char kGpuDeviceString[];
 extern const char kGpuDriverVendor[];
 extern const char kGpuDriverVersion[];
 extern const char kGpuLauncher[];
@@ -163,6 +164,7 @@ CONTENT_EXPORT extern const char kGpuSandboxFailuresFatal[];
 CONTENT_EXPORT extern const char kGpuSandboxStartEarly[];
 CONTENT_EXPORT extern const char kGpuStartupDialog[];
 extern const char kGpuVendorID[];
+extern const char kGpuVendorString[];
 CONTENT_EXPORT extern const char kHostResolverRules[];
 CONTENT_EXPORT extern const char kIgnoreCertificateErrors[];
 CONTENT_EXPORT extern const char kIgnoreGpuBlacklist[];