ChromeDriver: Handle key events properly on Mac

content/browser/devtools/protocol/native_input_event_builder_mac.mm

+// Copyright 2017 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.
+
+#include <Cocoa/Cocoa.h>
+#include "base/strings/sys_string_conversions.h"
+#include "content/browser/devtools/protocol/native_input_event_builder.h"
+#include "third_party/WebKit/public/platform/WebInputEvent.h"
+
+namespace content {
+namespace protocol {
+
+// Mac requires a native event to emulate key events. This method gives
+// only crude capabilities (see: crbug.com/667387).
+// The returned object has a retain count of 1.
+gfx::NativeEvent NativeInputEventBuilder::CreateEvent(
+    const NativeWebKeyboardEvent& event) {
+  NSEventType type = NSKeyUp;
+  if (event.GetType() == blink::WebInputEvent::kRawKeyDown ||
+      event.GetType() == blink::WebInputEvent::kKeyDown)
+    type = NSKeyDown;
+  const blink::WebUChar* textStartAddr = &event.text[0];
+  const int textLength =
+      std::find(textStartAddr,
+                textStartAddr + NativeWebKeyboardEvent::kTextLengthCap, '\0') -
+      textStartAddr;
+  NSString* character =
+      base::SysUTF16ToNSString(base::string16(textStartAddr, textLength));
+  int modifiers = event.GetModifiers();
+  NSUInteger flags =
+      (modifiers & blink::WebInputEvent::kShiftKey ? NSShiftKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::kControlKey ? NSControlKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::kAltKey ? NSAlternateKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::kMetaKey ? NSCommandKeyMask : 0);
+
+  return [[NSEvent keyEventWithType:type
+                           location:NSZeroPoint
+                      modifierFlags:flags
+                          timestamp:0
+                       windowNumber:0
+                            context:nil
+                         characters:character
+        charactersIgnoringModifiers:character
+                          isARepeat:NO
+                            keyCode:event.native_key_code] retain];
+};
+
+}  // namespace protocol
+}  // namespace content