Implemented ForceMaximizeBrowserWindowOnFirstRun policy, added unit test and browser test.

chrome/test/data/policy/policy_test_cases.json

 {
   "-- Template --": {
     "intro": "Top-level entries map a policy name to its test parameters, described below. The name of the top level entry should be of the form <policy name>[.suffix]. The optional suffix is used for defining multiple test cases for a single policy.",
 
     "os": ["List of operating systems that support this policy. Valid values:", "win", "linux", "mac", "chromeos", "Defaults to empty if not specified."],
     "official_only": "Whether this policy exists in official builds only. Defaults to |false| if not specified.",
     "can_be_recommended": "Whether a recommended value may be set for the policy. Defaults to |false| if not specified.",
     "test_policy": "A policy dictionary that should make the preferences affected by this policy become policy-controlled. Usually just sets the current policy. Defaults to an empty dictionary if not specified.",
     "note": "If the policy affects any preferences, the following array should be specified with one entry per such preference.",
     "pref_mappings": [
@@ skipping 2189 matching lines @@
     "test_policy": { "EasyUnlockAllowed": false },
     "pref_mappings": [
       { "pref": "easy_unlock.allowed" }
     ]
   },
 
   "SessionLocales": {
     "os": ["chromeos"],
     "can_be_recommended": true
   },
+  
+  "ForceMaximizeBrowserWindowOnFirstRun": {
+    "os": ["chromeos"],
+    "test_policy": { "ForceMaximizeBrowserWindowOnFirstRun": true },
+    "pref_mappings": [
+      { "pref": "ui.first_run_maximized" }
+    ]
+  },
 
   "----- Chrome OS device policies ---------------------------------------": {},
 
   "DevicePolicyRefreshRate": {
     "os": ["chromeos"],
     "test_policy": { "DevicePolicyRefreshRate": 300000 },
     "pref_mappings": [
       { "pref": "policy.device_refresh_rate",
         "local_state": true }
     ]
@@ skipping 193 matching lines @@
 
   "AdditionalLaunchParameters": {
   },
 
   "SuppressChromeFrameTurndownPrompt": {
   },
 
   "SkipMetadataCheck": {
   }
 }