Move switch kUseGpuInTests from chrome to content

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 cf0b4db5a53c025133ba23235bde963e1cc98fc8..999fba295c0bdbb376f493e4158d2b38e2e76d31 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -148,6 +148,9 @@ const char kDisableHistogramCustomizer[]    = "disable-histogram-customizer";
 // will present the rendered page rather than the browser process.
 const char kDisableImageTransportSurface[]  = "disable-image-transport-surface";
 
+// Use hardware gpu, if available, for tests.
+const char kUseGpuInTests[]                 = "use-gpu-in-tests";
+
 // Disables GPU hardware acceleration.  If software renderer is not in place,
 // then the GPU process won't launch.
 const char kDisableGpu[]                    = "disable-gpu";