rewrite includes to not need so much -Ifoo

Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/src/sksl/SkSLCompiler.cpp b/src/sksl/SkSLCompiler.cpp
index 0b0105d..e7ff7e4 100644
--- a/src/sksl/SkSLCompiler.cpp
+++ b/src/sksl/SkSLCompiler.cpp
@@ -5,28 +5,28 @@
  * found in the LICENSE file.
  */
 
-#include "SkSLCompiler.h"
+#include "src/sksl/SkSLCompiler.h"
 
-#include "SkSLByteCodeGenerator.h"
-#include "SkSLCFGGenerator.h"
-#include "SkSLCPPCodeGenerator.h"
-#include "SkSLGLSLCodeGenerator.h"
-#include "SkSLHCodeGenerator.h"
-#include "SkSLIRGenerator.h"
-#include "SkSLMetalCodeGenerator.h"
-#include "SkSLPipelineStageCodeGenerator.h"
-#include "SkSLSPIRVCodeGenerator.h"
-#include "ir/SkSLEnum.h"
-#include "ir/SkSLExpression.h"
-#include "ir/SkSLExpressionStatement.h"
-#include "ir/SkSLFunctionCall.h"
-#include "ir/SkSLIntLiteral.h"
-#include "ir/SkSLModifiersDeclaration.h"
-#include "ir/SkSLNop.h"
-#include "ir/SkSLSymbolTable.h"
-#include "ir/SkSLTernaryExpression.h"
-#include "ir/SkSLUnresolvedFunction.h"
-#include "ir/SkSLVarDeclarations.h"
+#include "src/sksl/SkSLByteCodeGenerator.h"
+#include "src/sksl/SkSLCFGGenerator.h"
+#include "src/sksl/SkSLCPPCodeGenerator.h"
+#include "src/sksl/SkSLGLSLCodeGenerator.h"
+#include "src/sksl/SkSLHCodeGenerator.h"
+#include "src/sksl/SkSLIRGenerator.h"
+#include "src/sksl/SkSLMetalCodeGenerator.h"
+#include "src/sksl/SkSLPipelineStageCodeGenerator.h"
+#include "src/sksl/SkSLSPIRVCodeGenerator.h"
+#include "src/sksl/ir/SkSLEnum.h"
+#include "src/sksl/ir/SkSLExpression.h"
+#include "src/sksl/ir/SkSLExpressionStatement.h"
+#include "src/sksl/ir/SkSLFunctionCall.h"
+#include "src/sksl/ir/SkSLIntLiteral.h"
+#include "src/sksl/ir/SkSLModifiersDeclaration.h"
+#include "src/sksl/ir/SkSLNop.h"
+#include "src/sksl/ir/SkSLSymbolTable.h"
+#include "src/sksl/ir/SkSLTernaryExpression.h"
+#include "src/sksl/ir/SkSLUnresolvedFunction.h"
+#include "src/sksl/ir/SkSLVarDeclarations.h"
 
 #ifdef SK_ENABLE_SPIRV_VALIDATION
 #include "spirv-tools/libspirv.hpp"