[Remoting iOS] Basic viewport manipulation support

remoting/client/ios/display/gl_display_handler.h

Index: remoting/client/ios/display/gl_display_handler.h
diff --git a/remoting/client/ios/display/gl_display_handler.h b/remoting/client/ios/display/gl_display_handler.h
index d6e7fe301b702051cb49901ee003620fb0ae25cf..a0fc57ebe84cb110deab7e58c6fa222c4727cf92 100644
--- a/remoting/client/ios/display/gl_display_handler.h
+++ b/remoting/client/ios/display/gl_display_handler.h
@@ -7,10 +7,11 @@
 
 #import <Foundation/Foundation.h>
 #import <GLKit/GLKit.h>
-
-#import "remoting/client/display/sys_opengl.h"
+#include <array>
 
 #include "base/memory/ptr_util.h"
+#import "remoting/client/display/sys_opengl.h"
+#include "remoting/client/view_matrix.h"
 
 namespace remoting {
 
@@ -24,17 +25,28 @@ class CursorShapeStub;
 }  // namespace protocol
 }  // namespace remoting
 
+@protocol GlDisplayHandlerDelegate<NSObject>
+
+// Notifies the delegate that the size of the desktop image has changed.
+- (void)canvasSizeChanged:(CGSize)size;
+
+@end
+
 @interface GlDisplayHandler : NSObject {
 }
 
 - (void)stop;
 
+- (void)setDelegate:(id<GlDisplayHandlerDelegate>)delegate;
+
 // Called once the GLKView created.
 - (void)onSurfaceCreated:(GLKView*)view;
 
 // Called every time the GLKView dimension is initialized or changed.
 - (void)onSurfaceChanged:(const CGRect&)frame;
 
+- (void)onPixelTransformationChanged:(const remoting::ViewMatrix&)matrix;
+
 - (std::unique_ptr<remoting::protocol::VideoRenderer>)CreateVideoRenderer;
 - (std::unique_ptr<remoting::protocol::CursorShapeStub>)CreateCursorShapeStub;