color: Make layout tests specify color space by command line flag

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 55740b365855679c1e85b8ab849815df263dbf8a..bf0b84e9efa8736c4401c7406db5114a54334fc5 100644
--- a/content/shell/app/shell_main_delegate.cc
+++ b/content/shell/app/shell_main_delegate.cc
@@ -44,6 +44,7 @@
 #include "ui/base/ui_base_paths.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/display/display_switches.h"
+#include "ui/gfx/switches.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
 
@@ -212,6 +213,18 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
       command_line.AppendSwitch(switches::kDisableGpuRasterization);
     }
 
+    // If the virtual test suite didn't specify a color space, then use the
+    // default layout test color space (GenericRGB for Mac and sRGB for all
+    // other platforms).
+    if (!command_line.HasSwitch(switches::kForceColorProfile)) {
+#if defined(OS_MACOSX)
+      command_line.AppendSwitchASCII(switches::kForceColorProfile,
+                                     "generic-rgb");
+#else
+      command_line.AppendSwitchASCII(switches::kForceColorProfile, "srgb");
+#endif
+    }
+
     command_line.AppendSwitch(cc::switches::kDisallowNonExactResourceReuse);
 
     // Unless/until WebM files are added to the media layout tests, we need to