Re-introduce printers for Node, Position, PositionAnchorType in GTest

This patch is inspired by http://crrev.com/1257203002, which makes printer for
|WTFString| in GTest.

This patch re-introduces printers for Node, Position and PositionAnchorType in
GTest rather than printing address of pointer by fixing ODR violation for
improving test authoring experience.

In http://crrev.com/1095913003, we introduced |Node| and |Position| printers for
GTest in "CoreTestHelpers.h". However, due by ODR violation, these printers
aren't used in GTest, since some test files uses |Node| as parameters for
GTest macros without including "CoreTestHelpers.h".

Note: ODR stands for One Definition Rule.

See details explanation in http://crrev.com/1257203002.

BUG=514330
TEST=webkit_unit_tests --gtest_fitler=EditingUtilitiesTest.*,VisibleUnitsTest.*

Review URL: https://codereview.chromium.org/1313283002

git-svn-id: svn://svn.chromium.org/blink/trunk@201207 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/core.gypi

@@ -3656,8 +3656,7 @@
         'webcore_testing_files': [
             '<(blink_core_output_dir)/testing/InternalSettingsGenerated.cpp',
             '<(blink_core_output_dir)/testing/InternalSettingsGenerated.h',
-            'testing/CoreTestHelpers.cpp',
-            'testing/CoreTestHelpers.h',
+            'testing/CoreTestPrinters.cpp',
             'testing/DictionaryTest.cpp',
             'testing/DictionaryTest.h',
             'testing/DummyPageHolder.cpp',

third_party/WebKit/Source/core/dom/Node.h

@@ -897,6 +897,11 @@ PassRefPtrWillBeRawPtr<T> T::create(Document& document) \
     return adoptRefWillBeNoop(new T(document)); \
 }
 
+// These printers are available only for testing in "webkit_unit_tests", and
+// implemented in "core/testing/CoreTestPrinters.cpp".
+std::ostream& operator<<(std::ostream&, const Node&);
+std::ostream& operator<<(std::ostream&, const Node*);
+
 } // namespace blink
 
 #ifndef NDEBUG

third_party/WebKit/Source/core/editing/EditingTestBase.h

@@ -6,7 +6,6 @@
 #define EditingTestBase_h
 
 #include "core/editing/Position.h"
-#include "core/testing/CoreTestHelpers.h"
 #include "wtf/Forward.h"
 #include <gtest/gtest.h>
 

third_party/WebKit/Source/core/editing/Position.h

@@ -390,6 +390,15 @@ inline PositionInComposedTree fromPositionInDOMTree<EditingInComposedTreeStrateg
     return toPositionInComposedTree(position);
 }
 
+// These printers are available only for testing in "webkit_unit_tests", and
+// implemented in "core/testing/CoreTestPrinters.cpp".
+std::ostream& operator<<(std::ostream&, const Node&);
+std::ostream& operator<<(std::ostream&, const Node*);
+
+std::ostream& operator<<(std::ostream&, PositionAnchorType);
+std::ostream& operator<<(std::ostream&, const Position&);
+std::ostream& operator<<(std::ostream&, const PositionInComposedTree&);
+
 } // namespace blink
 
 #ifndef NDEBUG

third_party/WebKit/Source/core/input/EventHandlerTest.cpp

@@ -13,7 +13,6 @@
 #include "core/html/HTMLDocument.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
-#include "core/testing/CoreTestHelpers.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/PlatformMouseEvent.h"
 #include <gtest/gtest.h>

third_party/WebKit/Source/core/testing/CoreTestHelpers.h

-// Copyright 2015 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.
-
-#ifndef CoreTestHelpers_h
-#define CoreTestHelpers_h
-
-#include "core/editing/Position.h"
-
-namespace blink {
-
-class Node;
-
-std::ostream& operator<<(std::ostream&, const Node&);
-std::ostream& operator<<(std::ostream&, const Node*);
-std::ostream& operator<<(std::ostream&, PositionAnchorType);
-std::ostream& operator<<(std::ostream&, const Position&);
-std::ostream& operator<<(std::ostream&, const PositionInComposedTree&);
-
-} // namespace blink
-
-#endif // CoreTestHelpers_h

third_party/WebKit/Source/core/testing/CoreTestHelpers.cpp → third_party/WebKit/Source/core/testing/CoreTestPrinters.cpp

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 #include "config.h"
-#include "core/testing/CoreTestHelpers.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"