Make IsSolidColor() a property on CC scrollbar layers.

content/browser/android/content_startup_flags.cc

Index: content/browser/android/content_startup_flags.cc
diff --git a/content/browser/android/content_startup_flags.cc b/content/browser/android/content_startup_flags.cc
index 1d959dc368f50db72b4778b0b3acea3206fdf437..b889a71e5b6306a1f8f27b2c300e168c2db3ea28 100644
--- a/content/browser/android/content_startup_flags.cc
+++ b/content/browser/android/content_startup_flags.cc
@@ -61,6 +61,15 @@ void SetContentCommandLineFlags(int max_render_process_count,
   parsed_command_line->AppendSwitch(switches::kEnableGestureTapHighlight);
   parsed_command_line->AppendSwitch(switches::kEnablePinch);
   parsed_command_line->AppendSwitch(switches::kEnableOverscrollNotifications);
+  parsed_command_line->AppendSwitch(cc::switches::kForceSolidColorScrollbars);
+
+  std::string thickness_string(cc::switches::kSolidColorScrollbarThickness);
+  thickness_string.append("=3");

[bulach, 2013/06/28 19:55:48]

nit: maybe extract these as named constants up above?
something like:

namespace {
const char kSolidColorScrollbarThicknessValue[] = "=3";
const char kSolidColorScrollbarColorValue[] = "=0x80808080";
}  // namespace

+  parsed_command_line->AppendSwitch(thickness_string);
+
+  std::string color_string(cc::switches::kSolidColorScrollbarColor);
+  color_string.append("=0x80808080");
+  parsed_command_line->AppendSwitch(color_string);
 
   // Run the GPU service as a thread in the browser instead of as a
   // standalone process.