browser-plugin: Allow accepting drag-n-drop events.

content/test/data/browser_plugin_dragging.html

+<textarea id='id_message'>
+</textarea>
+
+<object id="plugin"
+    tabindex="0"

[dcheng, 2012/10/11 20:11:51]

Nit: Do we need to explicitly set a tabindex?

[sadrul, 2012/10/11 20:41:21]

I believe tabindex is necessary to be able to tab-into the browser plugin, yes.

+    type="application/browser-plugin"
+    width="240"
+    height="120"
+    border="0px"
+    style='border: solid 1px red'

[dcheng, 2012/10/11 20:11:51]

Nit: It seems like line 10 cancels out line 9?

[sadrul, 2012/10/11 20:41:21]

Done.

+    contentEditable
+    >
+</object>
+
+<script>
+function dragLocation() {
+  return [id_message.offsetLeft + 10,
+          id_message.offsetTop + 5];

[dcheng, 2012/10/11 20:11:51]

Nit: For uniformity, it'd be nice to use offsetWidth / 2 and offsetHeight / 2
here as well.

[sadrul, 2012/10/11 20:41:21]

Done.

+}
+
+function dropLocation() {
+  return [plugin.offsetLeft + plugin.offsetWidth / 2,
+          plugin.offsetTop + plugin.offsetHeight / 2];
+}
+
+function SetSrc(src) {

[dcheng, 2012/10/11 20:11:51]

Nit: This inconsistent naming is wonky. I guess the ship has sailed on that one
though (I see it's used similarly in other browser plugin tests)

[sadrul, 2012/10/11 20:41:21]

Indeed. I have kept it as it is for now. But it is a good candidate for cleanup.

+  plugin = document.getElementById('plugin');
+  plugin.src = src;
+}
+</script>