ChromeDriver: Handle key events properly on Mac

content/browser/devtools/protocol/native_input_event_builder_mac.mm

Index: content/browser/devtools/protocol/native_input_event_builder_mac.mm
diff --git a/content/browser/devtools/protocol/native_input_event_builder_mac.mm b/content/browser/devtools/protocol/native_input_event_builder_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..45cab0a7a63487b8331596b565a616de0ada5916
--- /dev/null
+++ b/content/browser/devtools/protocol/native_input_event_builder_mac.mm
@@ -0,0 +1,49 @@
+// 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 "base/strings/sys_string_conversions.h"
+#include "content/browser/devtools/protocol/native_input_event_builder.h"
+#include "third_party/WebKit/public/platform/WebInputEvent.h"
+#include <Cocoa/Cocoa.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.type() == blink::WebInputEvent::RawKeyDown ||
+      event.type() == blink::WebInputEvent::KeyDown)
+    type = NSKeyDown;
+  const blink::WebUChar* textStartAddr = &event.text[0];
+  const int textLength =
+      std::find(textStartAddr,
+                textStartAddr + NativeWebKeyboardEvent::textLengthCap, '\0') -
+      textStartAddr;
+  NSString* character =
+      base::SysUTF16ToNSString(base::string16(textStartAddr, textLength));
+  int modifiers = event.modifiers();
+  NSUInteger flags =
+      (modifiers & blink::WebInputEvent::ShiftKey ? NSShiftKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::ControlKey ? NSControlKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::AltKey ? NSAlternateKeyMask : 0) |
+      (modifiers & blink::WebInputEvent::MetaKey ? NSCommandKeyMask : 0);
+
+  return [[NSEvent keyEventWithType:type
+                           location:NSZeroPoint
+                      modifierFlags:flags
+                          timestamp:0
+                       windowNumber:0
+                            context:nil
+                         characters:character
+        charactersIgnoringModifiers:character
+                          isARepeat:NO
+                            keyCode:event.nativeKeyCode] retain];
+};
+
+}  // namespace protocol
+}  // namespace content