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Imagine the following scenario:
1. An embedded object, e.g. a link, spans multiple lines.
2. There is some text before and after the embedded object.
"Before <embedded_object> after".

In IA2 and ATK, embedded objects are represented by an embedded object character in their parent's text.

Calling IAccessibleText::get_textAtOffset, or an equivalent API, and trying to determine the bounds
of the current line should return an offset range that includes the embedded object character, both when the call is made
somewhere inside the text "Before" as well as when the call is made somewhere inside the text "after".
This is necessary in order to signal to ATs that the embedded object starts somewhere inside the first line
and also that it ends somewhere inside the last line.
Otherwise, ATs Jaws and NVDA read only part of the last line when moving by line.
R=aleventhal@chromium.org, dmazzoni@chromium.org

Change-Id: I6f141e4fff5f60c05edbf80ff3f19ba920be7c31
Bug: 1028301
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934312
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720572}