Obey gtk-cursor-blink setting

chrome/common/renderer_preferences.h

Index: chrome/common/renderer_preferences.h
diff --git a/chrome/common/renderer_preferences.h b/chrome/common/renderer_preferences.h
index b08548e44848a07d4792a9dec130bfbad7332270..fe1c9305d257c5ae2e5502ae64a8b0d90f0c1cdd 100644
--- a/chrome/common/renderer_preferences.h
+++ b/chrome/common/renderer_preferences.h
@@ -51,7 +51,12 @@ struct RendererPreferences {
   // The color of the focus ring. Currently only used on Linux.
   SkColor focus_ring_color;
 
-  // Browser wants a look at all top level requests
+  // Cursor blink rate in seconds.
+  // Currently only changed from default on Linux.  Uses |gtk-cursor-blink|
+  // from GtkSettings.
+  double caret_blink_interval;
+
+  // Browser wants a look at all top level requests.
   bool browser_handles_top_level_requests;
 
   RendererPreferences()
@@ -61,6 +66,7 @@ struct RendererPreferences {
         subpixel_rendering(
             RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT),
         focus_ring_color(0),
+        caret_blink_interval(0),
         browser_handles_top_level_requests(false) {
   }
 };