[release] Add monitoring state to auto-roller json output.

tools/release/auto_roll.py

Index: tools/release/auto_roll.py
diff --git a/tools/release/auto_roll.py b/tools/release/auto_roll.py
index 16b80e840d501fcb85656be7f98f766cbe0fd0e3..669bb6441efbf75b0a5c6dc3baaba70788f75fa1 100755
--- a/tools/release/auto_roll.py
+++ b/tools/release/auto_roll.py
@@ -24,6 +24,7 @@ class Preparation(Step):
   MESSAGE = "Preparation."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'preparation'
     # Update v8 remote tracking branches.
     self.GitFetchOrigin()
     self.Git("fetch origin +refs/tags/*:refs/tags/*")
@@ -33,6 +34,7 @@ class DetectLastRoll(Step):
   MESSAGE = "Detect commit ID of the last Chromium roll."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'detect_last_roll'
     self["last_roll"] = self._options.last_roll
     if not self["last_roll"]:
       # Interpret the DEPS file to retrieve the v8 revision.
@@ -51,6 +53,7 @@ class DetectRevisionToRoll(Step):
   MESSAGE = "Detect commit ID of the V8 revision to roll."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'detect_revision'
     self["roll"] = self._options.revision
     if self["roll"]:
       # If the revision was passed on the cmd line, continue script execution
@@ -78,6 +81,7 @@ class DetectRevisionToRoll(Step):
     else:
       print("There is no newer v8 revision than the one in Chromium (%s)."
             % self["last_roll"])
+      self['json_output']['monitoring_state'] = 'up_to_date'
       return True
 
 
@@ -85,6 +89,7 @@ class PrepareRollCandidate(Step):
   MESSAGE = "Robustness checks of the roll candidate."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'prepare_candidate'
     self["roll_title"] = self.GitLog(n=1, format="%s",
                                      git_hash=self["roll"])
 
@@ -99,6 +104,7 @@ class SwitchChromium(Step):
   MESSAGE = "Switch to Chromium checkout."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'switch_chromium'
     cwd = self._options.chromium
     self.InitialEnvironmentChecks(cwd)
     # Check for a clean workdir.
@@ -113,6 +119,7 @@ class UpdateChromiumCheckout(Step):
   MESSAGE = "Update the checkout and create a new branch."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'update_chromium'
     cwd = self._options.chromium
     self.GitCheckout("master", cwd=cwd)
     self.DeleteBranch("work-branch", cwd=cwd)
@@ -129,6 +136,7 @@ class UploadCL(Step):
   MESSAGE = "Create and upload CL."
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'upload'
     cwd = self._options.chromium
     # Patch DEPS file.
     if self.Command("roll-dep-svn", "v8 %s" %
@@ -161,6 +169,7 @@ class CleanUp(Step):
   MESSAGE = "Done!"
 
   def RunStep(self):
+    self['json_output']['monitoring_state'] = 'success'
     print("Congratulations, you have successfully rolled %s into "
           "Chromium."
           % self["roll"])