Apply setInterval to new surface-context pairs

ui/gfx/gl/gl_context_glx.cc

Index: ui/gfx/gl/gl_context_glx.cc
diff --git a/ui/gfx/gl/gl_context_glx.cc b/ui/gfx/gl/gl_context_glx.cc
index 12013b553dde7d0401fdfc8a756efc0a275929bb..e67400400550c327360a9fcab173b4e6fc65eb4e 100644
--- a/ui/gfx/gl/gl_context_glx.cc
+++ b/ui/gfx/gl/gl_context_glx.cc
@@ -119,12 +119,21 @@ void GLContextGLX::SetSwapInterval(int interval) {
     // manager. At the moment, compositing window managers don't
     // respect this setting anyway (tearing still occurs) and it
     // dramatically increases latency.
-    if (!IsCompositingWindowManagerActive(GLSurfaceGLX::GetDisplay())) {
-      glXSwapIntervalEXT(
-          GLSurfaceGLX::GetDisplay(),
-          glXGetCurrentDrawable(),
-          interval);
+    if (interval == 1 &&
+        IsCompositingWindowManagerActive(GLSurfaceGLX::GetDisplay())) {
+      LOG(INFO) <<
+          "Forcing vsync off because compositing window manager was detected.";
+      interval = 0;
     }
+    glXSwapIntervalEXT(
+        GLSurfaceGLX::GetDisplay(),
+        glXGetCurrentDrawable(),
+        interval);
+  } else {
+    if(interval == 0)
+      LOG(WARNING) <<
+          "Could not disable vsync: driver does not "
+          "support GLX_EXT_swap_control";
   }
 }