Several EmuGL files were missing copyright notices; added them. Others
had them but below other code, which makes checking for them more
difficult -- I moved these to the top of the file.
These files were all created by GraphTech as a work for hire for AOSP.
Change-Id: Iee67bcf1c9b54ad5aa8a9288ded0382a974c32cb
Added rcGetGLString token to renderControl to query
a GL string constant from the current context from the host.
Implement glGetString functinality in EGL so that the string
value can be cached in the context structure and also
implementation can be shared between GLESv1 and GLESv2.
Also, fixed clientAPI context initialization check in
eglMakeCurrent. The check was for the previously bounded
context instead for the newly bounded context.
Change-Id: I41c0b4ad462c9ad5bd5c66719b41509bb1b7a947
