Update from chromium https://crrev.com/301315

ui/gl/gl.gyp

Index: ui/gl/gl.gyp
diff --git a/ui/gl/gl.gyp b/ui/gl/gl.gyp
index f3be5b26472768cd3d54652f62aca66a5c075402..c404ee7136ae21026e4884208615414294340a7a 100644
--- a/ui/gl/gl.gyp
+++ b/ui/gl/gl.gyp
@@ -113,6 +113,7 @@
         'gl_version_info.h',
         'gpu_switching_manager.cc',
         'gpu_switching_manager.h',
+        'gpu_switching_observer.h',
         'scoped_binders.cc',
         'scoped_binders.h',
         'scoped_make_current.cc',
@@ -311,6 +312,14 @@
             '../android/ui_android.gyp:ui_java',
           ],
         }],
+        ['ubsan==1', {
+          # Due to a bug in LLVM (http://llvm.org/bugs/show_bug.cgi?id=21349),
+          # compilation hangs for some GL source files. Disable -O2 temporarily
+          # until http://crbug.com/426271 is fixed.
+          'cflags!': [
+            '-O2',
+          ],
+        }],
       ],
     },
     {