Revert of Preliminary attempt to remove batch tracker

src/gpu/GrPathProcessor.cpp

Index: src/gpu/GrPathProcessor.cpp
diff --git a/src/gpu/GrPathProcessor.cpp b/src/gpu/GrPathProcessor.cpp
index 4660aa080fb393f3bbecc415344fb1b32e8f5487..5c07a8b156675a5e155bd877ea0c5241f7501875 100644
--- a/src/gpu/GrPathProcessor.cpp
+++ b/src/gpu/GrPathProcessor.cpp
@@ -57,19 +57,12 @@
 
     const PathBatchTracker& mine = m.cast<PathBatchTracker>();
     const PathBatchTracker& theirs = t.cast<PathBatchTracker>();
-    if (mine.fColor != theirs.fColor) {
-        return false;
-    }
-
-    if (mine.fUsesLocalCoords != theirs.fUsesLocalCoords) {
-        return false;
-    }
-
-    if (mine.fUsesLocalCoords && !this->localMatrix().cheapEqualTo(other.localMatrix())) {
-        return false;
-    }
-
-    return true;
+    return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords,
+                                   that, theirs.fUsesLocalCoords) &&
+           CanCombineOutput(mine.fInputColorType, mine.fColor,
+                            theirs.fInputColorType, theirs.fColor) &&
+           CanCombineOutput(mine.fInputCoverageType, 0xff,
+                            theirs.fInputCoverageType, 0xff);
 }
 
 void GrPathProcessor::getGLProcessorKey(const GrBatchTracker& bt,