Update angle to r048c4fe.
Update angle to r048c4fe.

This contains the following changes:
048c4fe  Fix buffer tests.
e04a5b7  Remove sh::InterfaceBlock member info.
28f70c3  Remove sh::Uniform::registerIndex and elementIndex.
bf9cce2  Use the block encoder class to store uniform offsets.
9fe25e9  Add a uniform register query to the translator.
18fe429  Added virtual destructors to VertexArrayImpl and BufferImpl
6cf8e1b  Reduce the number of TextureFormatCaps members.
ad8636e  Fix missing EGL extension function exports.
f0955f1  Update the samples and tests to use eglGetPlatformDisplayEXT.
591e6af  Add support for ANGLE_platform_angle.
78b1acd  Refactored Texture3D, separated out D3D logic
0511e80  Refactored TextureCubeMap, separated out D3D logic

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/418713002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@285203 0039d316-1c4b-4281-b951-d872f2087c98

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