[ycm] The YouCompleteMe configuration is not VIM specific.

Rename tools/vim/v8.ycm_extra_conf.py to .ycm_extra_conf.py, so every
YCM plugin (no matter if it's VIM or Emacs) should pick it up
automatically.

Also move the common tools/vim/ninja_output.py to tools/ninja/ as it's
also not related to VIM.

Review URL: https://codereview.chromium.org/904143003

Cr-Commit-Position: refs/heads/master@{#26602}

.ycm_extra_conf.py

@@ -9,11 +9,7 @@
 #   1. Install YCM [https://github.com/Valloric/YouCompleteMe]
 #          (Googlers should check out [go/ycm])
 #
-#   2. Point to this config file in your .vimrc:
-#          let g:ycm_global_ycm_extra_conf =
-#              '<v8_root>/tools/vim/v8.ycm_extra_conf.py'
-#
-#   3. Profit
+#   2. Profit
 #
 #
 # Usage notes:
@@ -129,7 +125,7 @@ def GetClangCommandFromNinjaForFilename(v8_root, filename):
         # try to use the default flags.
         return v8_flags
 
-  sys.path.append(os.path.join(v8_root, 'tools', 'vim'))
+  sys.path.append(os.path.join(v8_root, 'tools', 'ninja'))
   from ninja_output import GetNinjaOutputDirectory
   out_dir = os.path.realpath(GetNinjaOutputDirectory(v8_root))
 

tools/vim/ninja-build.vim

@@ -47,7 +47,7 @@ def path_to_build_dir(configuration):
   """Returns <v8_root>/<output_dir>/(Release|Debug)."""
 
   v8_root = path_to_source_root()
-  sys.path.append(os.path.join(v8_root, 'tools', 'vim'))
+  sys.path.append(os.path.join(v8_root, 'tools', 'ninja'))
   from ninja_output import GetNinjaOutputDirectory
   return GetNinjaOutputDirectory(v8_root, configuration)