Rename TransformFeedback members to match the spec.

BUG=angleproject:763

Change-Id: I12fa57de9263eb0cb5ff1840cf44b0a8f2a40912
Reviewed-on: https://chromium-review.googlesource.com/263721
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/validationES.cpp b/src/libANGLE/validationES.cpp
index b557707..3f59e21 100644
--- a/src/libANGLE/validationES.cpp
+++ b/src/libANGLE/validationES.cpp
@@ -1488,8 +1488,8 @@
 
     const State &state = context->getState();
     gl::TransformFeedback *curTransformFeedback = state.getCurrentTransformFeedback();
-    if (curTransformFeedback && curTransformFeedback->isStarted() && !curTransformFeedback->isPaused() &&
-        curTransformFeedback->getDrawMode() != mode)
+    if (curTransformFeedback && curTransformFeedback->isActive() && !curTransformFeedback->isPaused() &&
+        curTransformFeedback->getPrimitiveMode() != mode)
     {
         // It is an invalid operation to call DrawArrays or DrawArraysInstanced with a draw mode
         // that does not match the current transform feedback object's draw mode (if transform feedback
@@ -1579,7 +1579,7 @@
     const State &state = context->getState();
 
     gl::TransformFeedback *curTransformFeedback = state.getCurrentTransformFeedback();
-    if (curTransformFeedback && curTransformFeedback->isStarted() && !curTransformFeedback->isPaused())
+    if (curTransformFeedback && curTransformFeedback->isActive() && !curTransformFeedback->isPaused())
     {
         // It is an invalid operation to call DrawElements, DrawRangeElements or DrawElementsInstanced
         // while transform feedback is active, (3.0.2, section 2.14, pg 86)