Refactor HardwareRenderer to allow the use of OpenGL ES 2.0.

The current OpenGL ES 2.0 HardwareRenderer will fail and does not
even attempt to create a Canvas. The next step will be to create
a new native-backed Canvas that relies on OpenGL ES 2.0 and bypasses
the current OpenGL ES 1.0 implementation done in Skia.

Change-Id: I7a8e9f87f316e9137ef191bb5609213e160eaa4c