Add --idl-methods <filepath> parameter for skipping renaming of IDL methods.

tools/clang/rewrite_to_chrome_style/tests/methods-expected.cc

 // 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.
 
 #include "gen/thing.h"
 
 namespace v8 {
 
 class InterfaceOutsideOfBlink {
  public:
@@ skipping 284 matching lines @@
 
 namespace internal {
 
 class InternalClass {
  public:
   static void Method();
 };
 
 }  // namespace internal
 
+// Tests for --idl-methods.  See also
+// MethodsNamedAfterIdlMatcherState::SetupBlacklistForTesting method.
+class IdlTestClass {
+ public:
+  static int IdlTestMethodNoParams(char x) { return 123; }
+  static int idlTestMethodOneParam(char x) { return 123; }
+
+  int idlTestMethodNoParams() { return 123; }
+  int IdlTestMethodNoParams(int x) { return 123; }
+
+  int IdlTestMethodOneParam() { return 123; }
+  int idlTestMethodOneParam(int x) { return 123; }
+
+  int IdlTestMethodTwoOrThreeParams() { return 123; }
+  int idlTestMethodTwoOrThreeParams(int x, int y) { return 123; }
+  int idlTestMethodTwoOrThreeParams(int x, int y, int z) { return 123; }
+
+  int idlOptionalArgsPass(int x = 0) { return x; }
+  int IdlOptionalArgsStillTooMany(int x, int y = 0) { return x + y; }
+  int IdlOptionalArgsTooLittle(int x = 0) { return x; }
+
+  template <typename T>
+  int idlTemplateMethod(T x) {
+    return 123;
+  }
+
+  int path() { return 123; }
+  int GetPath(int x) { return 123; }
+};
+
+template <typename T>
+class IdlTemplateClass {
+ public:
+  int idlTestMethod(T x) { return 123; }
+};
+
 }  // namespace blink
 
 // https://crbug.com/640688 - need to rewrite method name below.
 void blink::ClassDeclaredInsideBlink::MethodDefinedOutsideBlink() {}
 void blink::internal::InternalClass::Method() {}