Support deps for actions in GN.

tools/gn/ninja_target_writer.h

 // Copyright (c) 2013 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 TOOLS_GN_NINJA_TARGET_WRITER_H_
 #define TOOLS_GN_NINJA_TARGET_WRITER_H_
 
 #include <iosfwd>
 
 #include "base/basictypes.h"
@@ skipping 15 matching lines @@
 
   static void RunAndWriteFile(const Target* target, const Toolchain* toolchain);
 
   virtual void Run() = 0;
 
  protected:
   // Writes to the output stream a stamp rule for input dependencies, and
   // returns the string to be appended to source rules that encodes the
   // order-only dependencies for the current target. This will include the "|"
   // character so can just be appended to the source rules. If there are no
-  // implicit dependencies, returns the empty string.
-  std::string WriteInputDepsStampAndGetDep() const;
+  // implicit dependencies and no extra target dependencies passed in, returns
+  // the empty string.
+  std::string WriteInputDepsStampAndGetDep(
+      const std::vector<const Target*>& extra_hard_deps) const;
 
   // Returns the FileTemplate constructed from the outputs variable. This is
   // like FileTemplate::GetForTargetOutputs except this additionally trims the
   // build directory from the front so we can just write the names without
   // further processing.
   FileTemplate GetOutputTemplate() const;
 
   const Settings* settings_;  // Non-owning.
   const Target* target_;  // Non-owning.
   const Toolchain* toolchain_;  // Non-owning.
   std::ostream& out_;
   PathOutput path_output_;
 
   NinjaHelper helper_;
 
  private:
   void WriteCopyRules();
 
   DISALLOW_COPY_AND_ASSIGN(NinjaTargetWriter);
 };
 
 #endif  // TOOLS_GN_NINJA_TARGET_WRITER_H_