Revert of Cleanup legacy NVPR-related definitions

Revert of Cleanup legacy NVPR-related definitions (patchset #6 id:100001 of https://codereview.chromium.org/1177243004/)

Reason for revert:
Breaks GLInterfaceValidationTest on Android bots.  Also getting this warning:

WARNING: nvprmsaa config requested, but driver path rendering support not available. Maybe update the driver? Your driver version string: "OpenGL ES 2.0 14.01003"

Original issue's description:
> Cleanup legacy NVPR-related definitions
> 
> Fixed-function NVPR codepaths were removed a while ago. Only NVPR API
> version 1.3 (PathFragmentInputGen) was left working. Remove
> backwards-compatibility code that was left behind.
> 
> Remove some NVPR API function typedefs that were left from initial
> commits.
> 
> Remove PathCoords function pointer from GrGLInterface, it has
> never been called and causes problems in the future, since it will
> not be implemented in the Chromium pseudo extension.
> 
> Avoid failing interface creation even if nvprmsaaXX config is
> requested but the driver is not recent enough. The SAN bots have
> old driver, but try to run nvprmsaa16 configs. Instead, print
> out a warning.
> 
> Committed: https://skia.googlesource.com/skia/+/fb8d6884e0e01d0c2f8596adf5af1efb0d08de7e
> 
> Committed: https://skia.googlesource.com/skia/+/e35b5d99d8dfcc6b2be844df28cba47436380809
> 
> Committed: https://skia.googlesource.com/skia/+/cfe62e30848eadead4358b0385e57723779b762b

TBR=joshualitt@google.com,cdalton@nvidia.com,bsalomon@google.com,kkinnunen@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[borenet, 2015-07-01 11:22:18]

Created Revert of Cleanup legacy NVPR-related definitions

[commit-bot: I haz the power, 2015-07-01 11:22:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1220883005/1

[commit-bot: I haz the power, 2015-07-01 11:22:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-01 11:22:28]

Failed to apply patch for src/gpu/GrContextFactory.cpp:
While running git apply --index -3 -p1;
  error: patch failed: src/gpu/GrContextFactory.cpp:68
  error: repository lacks the necessary blob to fall back on 3-way merge.
  error: src/gpu/GrContextFactory.cpp: patch does not apply

Patch:       src/gpu/GrContextFactory.cpp
Index: src/gpu/GrContextFactory.cpp
diff --git a/src/gpu/GrContextFactory.cpp b/src/gpu/GrContextFactory.cpp
index
f56e535b0e5587a891d04992bb69fb7e9976c301..edef2f7db1cdc4802b96b25bb22cfd7bde94a582
100755
--- a/src/gpu/GrContextFactory.cpp
+++ b/src/gpu/GrContextFactory.cpp
@@ -68,10 +68,6 @@
         if (!glInterface) {
             return NULL;
         }
-    } else {
-        if (!glInterface->hasExtension("GL_NV_path_rendering")) {
-            return NULL;
-        }
     }
 
     glCtx->makeCurrent();