Adding the iOS app and integration example with GlRenderer.

remoting/client/ios/chromiumoting/example_view_controller.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/client/ios/chromiumoting/example_view_controller.h"
+
+#import "remoting/client/sys_opengl.h"
+
+#include "base/message_loop/message_loop.h"
+#include "remoting/protocol/frame_stats.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
+
+@interface ExampleViewController ()
+
+// Helper functions dealing with the GL Context.
+- (void)setupGL;
+- (void)tearDownGL;
+
+@end
+
+@implementation ExampleViewController
+
+#pragma mark - UIViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  _gestures = [[ClientGestures alloc] initWithView:self.view];
+  _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

[Yuwei, 2016/12/19 23:26:09]

The renderer has optimizations that are only for GLES3. Could you create the
GLES2 context only when it fails to create GLES3 context? Or you can leave a
TODO if you don't want to do that in this CL.

+  _runtime = new remoting::ios::AppRuntime();
+  static_cast<GLKView*>(self.view).context = _context;
+  [self setupGL];
+}
+
+- (void)viewDidUnload {
+  [super viewDidUnload];
+  [self tearDownGL];
+
+  if ([EAGLContext currentContext] == _context) {
+    [EAGLContext setCurrentContext:nil];
+  }
+  _context = nil;
+}
+
+- (void)setupGL {
+  displayHandler = [[GlDisplayHandler alloc] initWithRuntime:_runtime];
+  [displayHandler created];
+}
+
+- (void)tearDownGL {
+  // TODO(nicholss): Implement this in a real application.
+}
+
+- (void)viewWillAppear:(BOOL)animated {
+  [super viewWillAppear:animated];
+}
+
+- (void)viewDidAppear:(BOOL)animated {
+  video_renderer_ =
+      (remoting::SoftwareVideoRenderer*)[displayHandler CreateVideoRenderer]
+          .get();
+}
+
+- (void)viewWillDisappear:(BOOL)animated {
+  [super viewWillDisappear:NO];
+}
+
+- (void)viewDidLayoutSubviews {
+  [super viewDidLayoutSubviews];
+}
+
+#pragma mark - GLKViewDelegate
+
+// In general, avoid expensive work in this function to maximize frame rate.
+- (void)glkView:(GLKView*)view drawInRect:(CGRect)rect {
+  if (displayHandler) {
+    [displayHandler glkView:view drawInRect:rect];
+    [displayHandler draw];
+  }
+}
+
+@end