Add CWVUIDelegate with method to customize context menu.

ios/web_view/internal/cwv_web_view.mm

Index: ios/web_view/internal/cwv_web_view.mm
diff --git a/ios/web_view/internal/cwv_web_view.mm b/ios/web_view/internal/cwv_web_view.mm
index 648cbfac4bbbb7392c8e367f9ef817c752444b88..7fae1af3709731157acd9fb478854416cebc2639 100644
--- a/ios/web_view/internal/cwv_web_view.mm
+++ b/ios/web_view/internal/cwv_web_view.mm
@@ -12,6 +12,7 @@
 #include "base/strings/sys_string_conversions.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/referrer.h"
+#import "ios/web/public/web_state/context_menu_params.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/ui/crw_web_delegate.h"
 #import "ios/web/public/web_state/web_state.h"
@@ -20,6 +21,8 @@
 #import "ios/web_view/internal/cwv_website_data_store_internal.h"
 #import "ios/web_view/internal/translate/web_view_translate_client.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
+#import "ios/web_view/public/cwv_html_element.h"
+#import "ios/web_view/public/cwv_ui_delegate.h"
 #import "ios/web_view/public/cwv_web_view_configuration.h"
 #import "ios/web_view/public/cwv_web_view_delegate.h"
 #import "ios/web_view/public/cwv_website_data_store.h"
@@ -45,6 +48,7 @@
 
 @synthesize delegate = _delegate;
 @synthesize loadProgress = _loadProgress;
+@synthesize UIDelegate = _UIDelegate;
 
 - (instancetype)initWithFrame:(CGRect)frame
                 configuration:(CWVWebViewConfiguration*)configuration {
@@ -185,4 +189,25 @@
   [self notifyDidUpdateWithChanges:CRIWVWebViewUpdateTypeProgress];
 }
 
+- (BOOL)webState:(web::WebState*)webState
+    handleContextMenu:(const web::ContextMenuParams&)params {
+  if ([_UIDelegate respondsToSelector:@selector

[Eugene But (OOO till 7-30), 2017/02/27 16:34:06]

Optional nit: do you want to reverse the condition and early return NO if
delegate does not respond to selector?

[michaeldo, 2017/02/27 19:02:05]

I agree, I like that better.

+                   (webView:runContextMenuWithTitle:forHTMLElement:inView

[Eugene But (OOO till 7-30), 2017/02/27 16:34:06]

Optional nit: Do you want to create a local variable for selector to improve the
formatting?

[michaeldo, 2017/02/27 19:02:05]

Done.

+                              :userGestureLocation:)]) {
+    NSURL* hyperlink = net::NSURLWithGURL(params.link_url);
+    NSURL* mediaSource = net::NSURLWithGURL(params.src_url);
+    CWVHTMLElement* htmlElement =

[Eugene But (OOO till 7-30), 2017/02/27 16:34:06]

s/htmlElement/HTMLElement

[michaeldo, 2017/02/27 19:02:06]

Done.

+        [[CWVHTMLElement alloc] initWithHyperlink:hyperlink
+                                      mediaSource:mediaSource
+                                             text:params.link_text];
+    [_UIDelegate webView:self
+        runContextMenuWithTitle:params.menu_title
+                 forHTMLElement:htmlElement
+                         inView:params.view
+            userGestureLocation:params.location];
+    return YES;
+  }
+  return NO;
+}
+
 @end