Revert "Re-land sksl fragment processor support"

This reverts commit c070939fd1a954b7a492bc30f0cf64a664b90181.

Reason for revert: 

This has some knock-on effects in the generation of Android.bp from our GN files.  See gn/gn_to_bp.py?  We're seeing things like "tmp/tmpsBVycx/gen/" end up in the include search path in Android.bp, which obviously don't exist there...

Original change's description:
> Re-land sksl fragment processor support
> 
> This reverts commit ed50200682e0de72c3abecaa4d5324ebcd1ed9f9.
> 
> Bug: skia:
> Change-Id: I9caa7454b391450620d6989dc472abb3cf7a2cab
> Reviewed-on: https://skia-review.googlesource.com/20965
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=benjaminwagner@google.com,ethannicholas@google.com

Change-Id: I502486b5405923b322429219f4cc396a45a14cea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20990
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 6 insertions, 22 deletions

diff --git a/src/sksl/SkSLGLSLCodeGenerator.h b/src/sksl/SkSLGLSLCodeGenerator.h
index aaf036900d..032b70eea1 100644
--- a/src/sksl/SkSLGLSLCodeGenerator.h
+++ b/src/sksl/SkSLGLSLCodeGenerator.h
@@ -13,7 +13,6 @@
 #include <unordered_map>
 
 #include "SkSLCodeGenerator.h"
-#include "SkSLStringStream.h"
 #include "ir/SkSLBinaryExpression.h"
 #include "ir/SkSLBoolLiteral.h"
 #include "ir/SkSLConstructor.h"
@@ -33,7 +32,6 @@
 #include "ir/SkSLPostfixExpression.h"
 #include "ir/SkSLProgramElement.h"
 #include "ir/SkSLReturnStatement.h"
-#include "ir/SkSLSetting.h"
 #include "ir/SkSLStatement.h"
 #include "ir/SkSLSwitchStatement.h"
 #include "ir/SkSLSwizzle.h"
@@ -76,12 +74,11 @@ public:
     GLSLCodeGenerator(const Context* context, const Program* program, ErrorReporter* errors,
                       OutputStream* out)
     : INHERITED(program, errors, out)
-    , fLineEnding("\n")
     , fContext(*context) {}
 
-    bool generateCode() override;
+    virtual bool generateCode() override;
 
-protected:
+private:
     void write(const char* s);
 
     void writeLine();
@@ -92,10 +89,6 @@ protected:
 
     void writeLine(const String& s);
 
-    virtual void writeHeader();
-
-    virtual void writePrecisionModifier();
-
     void writeType(const Type& type);
 
     void writeExtension(const Extension& ext);
@@ -106,7 +99,7 @@ protected:
 
     void writeFunctionDeclaration(const FunctionDeclaration& f);
 
-    virtual void writeFunction(const FunctionDefinition& f);
+    void writeFunction(const FunctionDefinition& f);
 
     void writeLayout(const Layout& layout);
 
@@ -114,13 +107,11 @@ protected:
 
     void writeGlobalVars(const VarDeclaration& vs);
 
-    virtual void writeVarInitializer(const Variable& var, const Expression& value);
-
     void writeVarDeclarations(const VarDeclarations& decl, bool global);
 
     void writeFragCoord();
 
-    virtual void writeVariableReference(const VariableReference& ref);
+    void writeVariableReference(const VariableReference& ref);
 
     void writeExpression(const Expression& expr, Precedence parentPrecedence);
 
@@ -136,13 +127,11 @@ protected:
 
     void writeSwizzle(const Swizzle& swizzle);
 
-    static Precedence GetBinaryPrecedence(Token::Kind op);
-
-    virtual void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence);
+    void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence);
 
     void writeTernaryExpression(const TernaryExpression& t, Precedence parentPrecedence);
 
-    virtual void writeIndexExpression(const IndexExpression& expr);
+    void writeIndexExpression(const IndexExpression& expr);
 
     void writePrefixExpression(const PrefixExpression& p, Precedence parentPrecedence);
 
@@ -154,8 +143,6 @@ protected:
 
     void writeFloatLiteral(const FloatLiteral& f);
 
-    virtual void writeSetting(const Setting& s);
-
     void writeStatement(const Statement& s);
 
     void writeStatements(const std::vector<std::unique_ptr<Statement>>& statements);
@@ -174,9 +161,6 @@ protected:
 
     void writeReturnStatement(const ReturnStatement& r);
 
-    virtual void writeProgramElement(const ProgramElement& e);
-
-    const char* fLineEnding;
     const Context& fContext;
     StringStream fHeader;
     String fFunctionHeader;