RenderText: Fix crash itemizing obscured emoji.

ui/gfx/render_text_unittest.cc

 // 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 "ui/gfx/render_text.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 631 matching lines @@
   render_text->RenderText::SetObscuredRevealIndex(2);
   EXPECT_EQ(ASCIIToUTF16("*h***"), render_text->GetDisplayText());
   render_text->RenderText::SetObscuredRevealIndex(5);
   const base::char16 valid_expect_5_and_6[] =
       {'*', '*', '*', '*', 0xD800, 0xDC00, 0};
   EXPECT_EQ(valid_expect_5_and_6, render_text->GetDisplayText());
   render_text->RenderText::SetObscuredRevealIndex(6);
   EXPECT_EQ(valid_expect_5_and_6, render_text->GetDisplayText());
 }
 
+TEST_F(RenderTextTest, ObscuredEmoji) {
+  // Ensures text itemization doesn't crash on obscured multi-char glyphs.
+  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  render_text->SetObscured(true);
+  gfx::Canvas canvas;
+  // Test the "Grinning face with smiling eyes" character followed by 'y'.
+  render_text->SetText(UTF8ToUTF16("\xF0\x9F\x98\x81y"));
+  render_text->Draw(&canvas);
+  // Test two "Camera" characters in a row.
+  render_text->SetText(UTF8ToUTF16("\xF0\x9F\x93\xB7\xF0\x9F\x93\xB7"));
+  render_text->Draw(&canvas);
+}
+
 // TODO(PORT): Fails for RenderTextMac.
 #if !defined(OS_MACOSX)
 
 TEST_F(RenderTextTest, ElidedText) {
   // TODO(skanuj) : Add more test cases for following
   // - RenderText styles.
   // - Cross interaction of truncate, elide and obscure.
   // - ElideText tests from text_elider.cc.
   struct {
     const wchar_t* text;
@@ skipping 2737 matching lines @@
     EXPECT_FALSE(backend.paint().isLCDRenderText());
     backend.GetHarfbuzzRunList()->runs()[0]->render_params.subpixel_rendering =
         FontRenderParams::SUBPIXEL_RENDERING_RGB;
     backend.DrawVisualText();
 #endif
     EXPECT_FALSE(backend.paint().isLCDRenderText());
   }
 }
 
 }  // namespace gfx