freezer: allow dynamic changes to freezer.state

create new profiles to allowing thawing and freezing back the freezer
cgroup

Bug: 151225245
Test: Manually verified that using the SetTaskProfiles method on the
profiles thaws and freezes back the freezer cgroup.

Change-Id: I7f3e193ebe79b49c1f6ac52b6138ff4ec26fc570

libprocessgroup/profiles/task_profiles.json

@@ -49,6 +49,11 @@
       "Name": "UClampMax",
       "Controller": "cpu",
       "File": "cpu.uclamp.max"
+    },
+    {
+      "Name": "FreezerState",
+      "Controller": "freezer",
+      "File": "frozen/freezer.state"
     }
   ],
 
@@ -531,6 +536,32 @@
           }
         }
       ]
+    },
+    {
+      "Name": "FreezerThawed",
+      "Actions": [
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "FreezerState",
+            "Value": "THAWED"
+          }
+        }
+      ]
+    },
+    {
+      "Name": "FreezerFrozen",
+      "Actions": [
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "FreezerState",
+            "Value": "FROZEN"
+          }
+        }
+      ]
     }
   ],
 

rootdir/init.rc

@@ -332,7 +332,7 @@ on init
     chown system system /dev/freezer/frozen/freezer.state
     chown system system /dev/freezer/frozen/cgroup.procs
 
-    chmod 0444 /dev/freezer/frozen/freezer.state
+    chmod 0664 /dev/freezer/frozen/freezer.state
 
     # make the PSI monitor accessible to others
     chown system system /proc/pressure/memory