Disable GPU Raster for non-GPU-specific LayoutTests

content/shell/app/shell_main_delegate.cc

Index: content/shell/app/shell_main_delegate.cc
diff --git a/content/shell/app/shell_main_delegate.cc b/content/shell/app/shell_main_delegate.cc
index 174c1d5ae11f32a8089eef35ba114ddf40f86125..b3cb190426d22ef09bdc7f9dd6111fd8cdbf57b2 100644
--- a/content/shell/app/shell_main_delegate.cc
+++ b/content/shell/app/shell_main_delegate.cc
@@ -204,6 +204,11 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
 
     command_line.AppendSwitch(switches::kEnablePartialRaster);
 
+    if (!command_line.HasSwitch(switches::kForceGpuRasterization) &&
+        !command_line.HasSwitch(switches::kEnableGpuRasterization)) {
+      command_line.AppendSwitch(switches::kDisableGpuRasterization);
+    }
+
     // Unless/until WebM files are added to the media layout tests, we need to
     // avoid removing MP4/H264/AAC so that layout tests can run on Android.
 #if !defined(OS_ANDROID)