Refactor how we store and use samplers in Ganesh

include/gpu/GrShaderVar.h

Index: include/gpu/GrShaderVar.h
diff --git a/include/gpu/GrShaderVar.h b/include/gpu/GrShaderVar.h
index 3f56eaf70acb9e2245592361e84a2a14b149c91f..78e08e0d9ab611edd32a60b3d7a543231cdd854c 100644
--- a/include/gpu/GrShaderVar.h
+++ b/include/gpu/GrShaderVar.h
@@ -51,7 +51,6 @@ public:
         , fName(name)
         , fCount(arrayCount)
         , fPrecision(precision) {
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         SkASSERT(kVoid_GrSLType != type);
     }
 
@@ -62,7 +61,6 @@ public:
         , fName(name)
         , fCount(arrayCount)
         , fPrecision(precision) {
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         SkASSERT(kVoid_GrSLType != type);
     }
 
@@ -73,7 +71,6 @@ public:
         , fName(name)
         , fCount(arrayCount)
         , fPrecision(precision) {
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         SkASSERT(kVoid_GrSLType != type);
     }
 
@@ -91,7 +88,6 @@ public:
              GrSLPrecision precision = kDefault_GrSLPrecision,
              int count = kNonArray) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         fType = type;
         fTypeModifier = typeModifier;
         fName = name;
@@ -105,7 +101,6 @@ public:
              GrSLPrecision precision = kDefault_GrSLPrecision,
              int count = kNonArray) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         fType = type;
         fTypeModifier = typeModifier;
         fName = name;