Update from https://crrev.com/303153

ui/gl/gl_fence_egl.cc

Index: ui/gl/gl_fence_egl.cc
diff --git a/ui/gl/gl_fence_egl.cc b/ui/gl/gl_fence_egl.cc
index 2ff18fc8353a09ee4c4f86f3c0aad84d6f3e5bbf..c96d6d8157dea1b5c9c5f1915e6149d5379ca316 100644
--- a/ui/gl/gl_fence_egl.cc
+++ b/ui/gl/gl_fence_egl.cc
@@ -4,6 +4,7 @@
 
 #include "ui/gl/gl_fence_egl.h"
 
+#include "ui/gl/egl_util.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 
@@ -24,6 +25,8 @@ bool GLFenceEGL::HasCompleted() {
   EGLint value = 0;
   if (eglGetSyncAttribKHR(display_, sync_, EGL_SYNC_STATUS_KHR, &value) !=
       EGL_TRUE) {
+    LOG(ERROR) << "Failed to get EGLSync attribute. error code:"
+               << eglGetError();
     return true;
   }
 
@@ -35,7 +38,12 @@ void GLFenceEGL::ClientWait() {
   if (!flush_event_.get() || flush_event_->IsSignaled()) {
     EGLint flags = 0;
     EGLTimeKHR time = EGL_FOREVER_KHR;
-    eglClientWaitSyncKHR(display_, sync_, flags, time);
+    EGLint result = eglClientWaitSyncKHR(display_, sync_, flags, time);
+    DCHECK_NE(EGL_TIMEOUT_EXPIRED_KHR, result);
+    if (result == EGL_FALSE) {
+      LOG(FATAL) << "Failed to wait for EGLSync. error:"
+                 << ui::GetLastEGLErrorString();
+    }
   } else {
     LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
   }
@@ -48,7 +56,10 @@ void GLFenceEGL::ServerWait() {
   }
   if (!flush_event_.get() || flush_event_->IsSignaled()) {
     EGLint flags = 0;
-    eglWaitSyncKHR(display_, sync_, flags);
+    if (eglWaitSyncKHR(display_, sync_, flags) == EGL_FALSE) {
+      LOG(FATAL) << "Failed to wait for EGLSync. error:"
+                 << ui::GetLastEGLErrorString();
+    }
   } else {
     LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
   }