Enable gesture events handling on Android.

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 6fd3cad44dd0212d4c589274ce2b91841b7dca8d..32b57c8f3ef0fc9e2c238fed029d7a0ff6fff010 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -637,6 +637,15 @@ const char kZygoteProcess[]                 = "zygote";
 // Enables moving cursor by word in visual order.
 const char kEnableVisualWordMovement[]      = "enable-visual-word-movement";
 
+#if defined(OS_ANDROID)
+// Omnibus flag setting an Android graphics mode.  May be:
+//   "basic" (untiled software path)
+//   "compositor" (hardware-accelerated compositing),
+const char kGraphicsMode[]                  = "graphics-mode";
+const char kGraphicsModeValueBasic[]        = "basic";
+const char kGraphicsModeValueCompositor[]   = "compositor";
+#endif
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 // Specify the amount the trackpad should scroll by.
 const char kScrollPixels[]                  = "scroll-pixels";