Switch android to use GLESv3.

[glennw]

No description provided.

[glennw]

r? @larsbergstrom or @pcwalton

[larsbergstrom]

The purely administrative bits look good to me, but there are some constant changes in there that I'd like for @pcwalton to take a quick look at, if possible.

Thanks for doing this, @glennw! This is huge for all the people clamoring for Android support for Servo+WR in master.

[larsbergstrom]

From Travis:

/home/travis/.cargo/git/checkouts/webrender_traits-e24a580db67dabe6/master/src/webgl.rs:295:17: 295:38 error: unresolved name `gl::copy_tex_image_2d` [E0425]

/home/travis/.cargo/git/checkouts/webrender_traits-e24a580db67dabe6/master/src/webgl.rs:295                 gl::copy_tex_image_2d(target, level, internal_format, x, y, width, height, border),

                                                                                                            ^~~~~~~~~~~~~~~~~~~~~

/home/travis/.cargo/git/checkouts/webrender_traits-e24a580db67dabe6/master/src/webgl.rs:295:17: 295:38 help: run `rustc --explain E0425` to see a detailed explanation

error: aborting due to previous error

error: Could not compile `webrender_traits`.

[larsbergstrom]

@pcwalton Could you please take a look at these changes (assuming gw can fix the build failure)? This work is blocking Android. Thanks!

[larsbergstrom]

@pcwalton Can you please look at this PR this week? Thanks!

[glennw]

@larsbergstrom I'm not sure what was up with travis - I retried the PR on travis this morning and it is green now.

[pcwalton]

@bors-servo: r+

[bors-servo]

📌 Commit 46fc29e has been approved by pcwalton

[bors-servo]

⌛ Testing commit 46fc29e with merge 4353e6b...

[bors-servo]

☀️ Test successful - travis