Add IGNORE_DEPS_CHANGES flag and coverage builder.

scripts/slave/recipe_modules/chromium/api.py

Index: scripts/slave/recipe_modules/chromium/api.py
diff --git a/scripts/slave/recipe_modules/chromium/api.py b/scripts/slave/recipe_modules/chromium/api.py
index e3ff4ad963242fc29dac18f85ac2f5ab0173a6d4..b5756c02e27f9751d28a158f1181f6e03da6f726 100644
--- a/scripts/slave/recipe_modules/chromium/api.py
+++ b/scripts/slave/recipe_modules/chromium/api.py
@@ -79,6 +79,8 @@ class ChromiumApi(recipe_api.RecipeApi):
         self.m.goma.service_account_json_path
     if self.c.env.FORCE_MAC_TOOLCHAIN:
       ret['FORCE_MAC_TOOLCHAIN'] = self.c.env.FORCE_MAC_TOOLCHAIN
+    if self.c.env.IGNORE_DEPS_CHANGES:
+      ret['IGNORE_DEPS_CHANGES'] = '1'

[Dirk Pranke, 2016/10/15 22:40:31]

We shouldn't be using environment variables for anything related to how things
are built; this should be a GN argument like anything else.

However, that can be fixed in a follow-up patch as long as we file a bug for
this.

[dnj, 2016/10/16 16:44:27]

Agreed. IMO the thing to do here is to make an actual GVC image target in GN and
just build that. This is just a literal transcription of what the previous
builder was doing.

     return ret
 
   @property