Improve ellipsize performance Instead of iterate all ellipsized characters, only iterate the necessary ranges for copying. Bug: 188913943 Test: atest CtsTextTestCases CtsGraphicsTestCases CtsWidgetTestCases Change-Id: I3d03b1e3897e427c23fbe51315f412c57a4ce9e9 (cherry picked from commit 2c6121f3e3c52965ae33317e4fe7a273fd1742c6) (cherry picked from commit 40d7a4535aba93073264bf8998daf588f0923986)