Fix cursor position calculation.
Fix cursor position calculation.

The cursor position calculation of not well known CharSequence implementation
has problem. getTextRunCursor() returns the relative path of passed string
buffer, so need to fix the origin by adding the copied buffer origin.

BUG: 17448027
Change-Id: I413c553bfccbccee4a390b6c83aa09ac7fd04126

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base