Add policies to control the disk cache size.

chrome/app/policy/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 82 matching lines @@
 #   policy configuration files. 'dynamic_refresh' controls if the generated
 #   documentation should state that the policy supports dynamic refresh or not.
 #   Supporting dynamic refresh means that Chrome respects the changes to the
 #   policy immediately, without the need for restart.
 #
 # IDs:
 #   Since a Protocol Buffer definition is generated from this file, unique and
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 109
+#   For your editing convenience: highest ID currently used: 111
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
 #     $1 -> Google Chrome / Chromium
 #     $2 -> Google Chrome OS / Chromium OS
 #     $3 -> Google Chrome Frame / Chromium Frame
 #     $6 is reserved for doc_writer
 #
 # Device Policy:
 #   An additional flag device_only (optional, defaults to False) indicates
@@ skipping 472 matching lines @@
       'features': {'dynamic_refresh': 0},
       'example_value': '${user_home}/Chrome_cache',
       'id': 88,
       'caption': '''Set disk cache directory''',
       'desc': '''Configures the directory that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for storing cached files on the disk.
 
       If you set this policy, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use the provided directory regardless whether the user has specified the '--disk-cache-dir' flag or not.''',
       'label': '''Set disk cache directory''',
     },
     {
+      'name': 'DiskCacheSize',
+      'type': 'int',
+      'supported_on': ['chrome.*:17-'],

[Joao da Silva, 2011/11/15 14:12:53]

These policies can be supported on chrome_os too with the changes proposed in
the other comments.

+      'features': {'dynamic_refresh': 0},
+      'example_value': 100,
+      'id': 110,
+      'caption': '''Set disk cache size in megabytes''',
+      'desc': '''Configures the cache size that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for storing cached files on the disk.
+
+      If you set this policy, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use the provided cache size regardless whether the user has specified the '--disk-cache-size' flag or not.
+
+      If the value of this policy is 0, the default cache size will be used but the user will not be able to change it.
+
+      If this policy is not set the default size will be used and the user will be able to override it with the --disk-cache-size flag.''',
+      'label': '''Set disk cache size''',
+    },
+    {
+      'name': 'MediaCacheSize',
+      'type': 'int',
+      'supported_on': ['chrome.*:17-'],
+      'features': {'dynamic_refresh': 0},
+      'example_value': 250,
+      'id': 111,
+      'caption': '''Set media disk cache size''',
+      'desc': '''Configures the chache size that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for storing cached media files on the disk.
+
+      If you set this policy, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use the provided directory regardless whether the user has specified the '--media-cache-dir' flag or not.

[Joao da Silva, 2011/11/15 14:12:53]

"will use the provided _directory_"? "--media-cache-dir"? :-)

+
+      If the value of this policy is 0, the default cache size will be used but the user will not be able to change it.
+
+      If this policy is not set the default size will be used and the user will be able to override it with the --media-cache-size flag.''',
+      'label': '''Set media disk cache size''',

[Joao da Silva, 2011/11/15 14:12:53]

Nit: the label defaults to the caption value, so if they're the same the label
can be left out.

+    },
+    {
       'name': 'DownloadDirectory',
       'type': 'string',
       'supported_on': ['chrome.*:11-'],
       'features': {'dynamic_refresh': 1},
       'example_value': '/home/${user_name}/Downloads',
       'id': 64,
       'caption': '''Set download directory''',
       'desc': '''Configures the directory that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for downloading files.
 
       If you set this policy, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use the provided directory regardless whether the user has specified one or enabled the flag to be prompted for download location every time.''',
@@ skipping 1344 matching lines @@
       'desc': '''The name of the feature that indicates for a given policy that changes to it are respected by Chrome without a browser restart''',
       'text': '''Dynamic Policy Refresh'''
     },
     'doc_deprecated': {
       'desc': '''Text appended in parentheses to the policy name to indicate t hat it has been deprecated''',
       'text': 'deprecated',
     }
   },
   'placeholders': [],
 }