disable scissor test during glBlitFramebuffer for onCopySurface
Improve speed on approxEqual() in SkMatrix
create RGBA format texture for OpenGLES when the texture is render target

Only RGBA is attachable to a framebuffer in OpenGL ES
Use alpha mask texture or software mask when stencil bits = 0 in multisampled render target
Merge branch 'henry' into CB-399
Merge branch 'henry' into CB-399
WIP: Support batching in GrInOrderBuffer/GrDrawTarget when more than one shapes are batched.