Reland of ui/gl: Initialize the ANGLE Platform on all configurations

ui/gl/egl_api_unittest.cc

Index: ui/gl/egl_api_unittest.cc
diff --git a/ui/gl/egl_api_unittest.cc b/ui/gl/egl_api_unittest.cc
index b9dbd15a034f5d8224cddae2aee5feaff4fcc131..772cf0646a1819ffa8b79583f0d719d14c527b6a 100644
--- a/ui/gl/egl_api_unittest.cc
+++ b/ui/gl/egl_api_unittest.cc
@@ -25,6 +25,7 @@
     g_driver_egl.fn.eglGetCurrentDisplayFn = &FakeGetCurrentDisplay;
     g_driver_egl.fn.eglGetDisplayFn = &FakeGetDisplay;
     g_driver_egl.fn.eglGetErrorFn = &FakeGetError;
+    g_driver_egl.fn.eglGetProcAddressFn = &FakeGetProcAddress;
   }
 
   void TearDown() override {
@@ -80,6 +81,11 @@
 
   static EGLint GL_BINDING_CALL FakeGetError() {
     return EGL_SUCCESS;
+  }
+
+  static __eglMustCastToProperFunctionPointerType GL_BINDING_CALL
+  FakeGetProcAddress(const char* procname) {
+    return nullptr;
   }
 
   std::pair<const char*, const char*> GetExtensions() {