Minimize distance between text and pin in direct share row

When the TextView takes up multiple lines, the layout acts as if the
full width is used, thus pushing the pin all the way to the left.

This change measures the text itself and computes an ideal width for the
TextView based upon the line measurements.

Test: Visual inspection: pin several targets: single line, first line
      longer, second line longer, etc. Observe spacing.
Bug: 232445263
Change-Id: Id7601c58aae1e28c66c5311ba66b288443d73272