[Merge to 2883] Fix memory leaks in macOS Sierra for IME.

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <Cocoa/Cocoa.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <tuple>
@@ skipping 299 matching lines @@
 };
 
 TEST_F(RenderWidgetHostViewMacTest, Basic) {
 }
 
 TEST_F(RenderWidgetHostViewMacTest, AcceptsFirstResponder) {
   // The RWHVCocoa should normally accept first responder status.
   EXPECT_TRUE([rwhv_cocoa_.get() acceptsFirstResponder]);
 }
 
+// This test verifies that RenderWidgetHostViewCocoa's implementation of
+// NSTextInputClientConformance conforms to requirements.
+TEST_F(RenderWidgetHostViewMacTest, NSTextInputClientConformance) {
+  NSRange selectedRange = [rwhv_cocoa_ selectedRange];
+  EXPECT_EQ(NSNotFound, selectedRange.location);
+  EXPECT_EQ(0u, selectedRange.length);
+
+  NSRange actualRange = NSMakeRange(1u, 2u);
+  NSAttributedString* actualString = [rwhv_cocoa_
+      attributedSubstringForProposedRange:NSMakeRange(NSNotFound, 0u)
+                              actualRange:&actualRange];
+  EXPECT_EQ(nil, actualString);
+  EXPECT_EQ(NSNotFound, actualRange.location);
+  EXPECT_EQ(0u, actualRange.length);
+
+  actualString = [rwhv_cocoa_
+      attributedSubstringForProposedRange:NSMakeRange(NSNotFound, 15u)
+                              actualRange:&actualRange];
+  EXPECT_EQ(nil, actualString);
+  EXPECT_EQ(NSNotFound, actualRange.location);
+  EXPECT_EQ(0u, actualRange.length);
+}
+
 TEST_F(RenderWidgetHostViewMacTest, Fullscreen) {
   rwhv_mac_->InitAsFullscreen(NULL);
   EXPECT_TRUE(rwhv_mac_->pepper_fullscreen_window());
 
   // Break the reference cycle caused by pepper_fullscreen_window() without
   // an <esc> event. See comment in
   // release_pepper_fullscreen_window_for_testing().
   rwhv_mac_->release_pepper_fullscreen_window_for_testing();
 }
 
@@ skipping 1127 matching lines @@
   // Repeat for the tab's view.
   [rwhv_cocoa_ setMarkedText:text
                selectedRange:selectedRange
             replacementRange:replacementRange];
   EXPECT_TRUE([rwhv_cocoa_ hasMarkedText]);
   rwhv_mac_->ImeCancelComposition();
   EXPECT_FALSE([rwhv_cocoa_ hasMarkedText]);
 }
 
 }  // namespace content