implement GetProcessExecutablePath() on OpenBSD and start using it

base/base_paths_linux.cc

 // Copyright (c) 2011 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 "base/base_paths.h"
 
 #include <ostream>
 #include <string>
 
 #include "build/build_config.h"
@@ skipping 50 matching lines @@
 #elif defined(OS_SOLARIS)
       char bin_dir[PATH_MAX + 1];
       if (realpath(getexecname(), bin_dir) == NULL) {
         NOTREACHED() << "Unable to resolve " << getexecname() << ".";
         return false;
       }
       *result = FilePath(bin_dir);
       return true;
 #elif defined(OS_OPENBSD)
       // There is currently no way to get the executable path on OpenBSD
-      *result = FilePath("/usr/local/chrome/chrome");
+      char *cpath;
+      if ((cpath = getenv("CHROME_EXE_PATH")) != NULL)
+        *result = FilePath(cpath);
+      else
+        *result = FilePath("/usr/local/chrome/chrome");
       return true;
 #endif
     }
     case base::DIR_SOURCE_ROOT: {
       // Allow passing this in the environment, for more flexibility in build
       // tree configurations (sub-project builds, gyp --output_dir, etc.)
       scoped_ptr<base::Environment> env(base::Environment::Create());
       std::string cr_source_root;
       if (env->GetVar("CR_SOURCE_ROOT", &cr_source_root)) {
         path = FilePath(cr_source_root);
@@ skipping 39 matching lines @@
       scoped_ptr<base::Environment> env(base::Environment::Create());
       FilePath cache_dir(base::nix::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
                                                     ".cache"));
       *result = cache_dir;
       return true;
   }
   return false;
 }
 
 }  // namespace base