I have taken over this patch, original authored by Adam Hunter (adamhunter).

The original issue is: http://codereview.chromium.org/144019

--------------

Functionality has been requested in the Extension API for Javascript to
take screenshots of the currently visible tab.  This changelist builds this
function, chrome.tabs.getVisibleScreenCapture.  This function takes a
single callback function and returns to that function a data URL of a JPEG
image of the current screen.  A simple sample extension is provided as a
use case.

BUG=14760
TEST=There is an extension in chrome\test\data\extensions\samples\screenshot,
load this extension.  It creates a toolstrip button.  Click this button, you
should get a page with a screenshot of the active tab.  The API function
is found at chrome.tabs.getVisibleScreenCapture.

Review URL: http://codereview.chromium.org/160228

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@23259 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 12 insertions, 0 deletions

diff --git a/chrome/common/extensions/api/extension_api.json b/chrome/common/extensions/api/extension_api.json
index e98fdd3..06277ef 100755
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -398,6 +398,18 @@
             ]
           }
         ]
+      },
+      {
+        "name": "captureVisibleTab",
+        "type": "function",
+        "description": "Captures the visible area of the visible tab in the given window.",
+        "parameters": [
+          {"type": "integer", "name": "windowId", "minimum": 0, "optional": true, "description": "The target window. If <var>null</var> or <var>undefined</var>, the 'current' window will be assumed."},
+          {"type": "function", "name": "callback", "parameters": [
+              {"type": "string", "name": "dataUrl", "description": "a data url encoding of the captured tab."}
+            ]
+          }
+        ]
       }
     ],
     "events": [