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/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index c2a3595..d3545a6 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -5,42 +5,42 @@
 * found in the LICENSE file.
 */
 
-#include "Viewer.h"
-#include "BisectSlide.h"
-#include "CommandLineFlags.h"
-#include "CommonFlags.h"
-#include "EventTracingPriv.h"
-#include "GMSlide.h"
-#include "GrContext.h"
-#include "GrContextPriv.h"
-#include "GrGpu.h"
-#include "GrPersistentCacheUtils.h"
-#include "ImageSlide.h"
-#include "ParticlesSlide.h"
-#include "Resources.h"
-#include "SKPSlide.h"
-#include "SampleSlide.h"
-#include "SkCanvas.h"
-#include "SkColorSpacePriv.h"
-#include "SkData.h"
-#include "SkGraphics.h"
-#include "SkImagePriv.h"
-#include "SkJSONWriter.h"
-#include "SkMakeUnique.h"
-#include "SkMD5.h"
-#include "SkOSFile.h"
-#include "SkOSPath.h"
-#include "SkPaintFilterCanvas.h"
-#include "SkPictureRecorder.h"
-#include "SkScan.h"
-#include "SkStream.h"
-#include "SkSurface.h"
-#include "SkTaskGroup.h"
-#include "SkTo.h"
-#include "SlideDir.h"
-#include "SvgSlide.h"
-#include "ToolUtils.h"
-#include "ccpr/GrCoverageCountingPathRenderer.h"
+#include "include/core/SkCanvas.h"
+#include "include/core/SkData.h"
+#include "include/core/SkGraphics.h"
+#include "include/core/SkPictureRecorder.h"
+#include "include/core/SkStream.h"
+#include "include/core/SkSurface.h"
+#include "include/gpu/GrContext.h"
+#include "include/private/SkTo.h"
+#include "include/utils/SkPaintFilterCanvas.h"
+#include "src/core/SkColorSpacePriv.h"
+#include "src/core/SkImagePriv.h"
+#include "src/core/SkMD5.h"
+#include "src/core/SkMakeUnique.h"
+#include "src/core/SkOSFile.h"
+#include "src/core/SkScan.h"
+#include "src/core/SkTaskGroup.h"
+#include "src/gpu/GrContextPriv.h"
+#include "src/gpu/GrGpu.h"
+#include "src/gpu/GrPersistentCacheUtils.h"
+#include "src/gpu/ccpr/GrCoverageCountingPathRenderer.h"
+#include "src/utils/SkJSONWriter.h"
+#include "src/utils/SkOSPath.h"
+#include "tools/Resources.h"
+#include "tools/ToolUtils.h"
+#include "tools/flags/CommandLineFlags.h"
+#include "tools/flags/CommonFlags.h"
+#include "tools/trace/EventTracingPriv.h"
+#include "tools/viewer/BisectSlide.h"
+#include "tools/viewer/GMSlide.h"
+#include "tools/viewer/ImageSlide.h"
+#include "tools/viewer/ParticlesSlide.h"
+#include "tools/viewer/SKPSlide.h"
+#include "tools/viewer/SampleSlide.h"
+#include "tools/viewer/SlideDir.h"
+#include "tools/viewer/SvgSlide.h"
+#include "tools/viewer/Viewer.h"
 
 #include <stdlib.h>
 #include <map>
@@ -49,11 +49,11 @@
 #include "misc/cpp/imgui_stdlib.h"  // For ImGui support of std::string
 
 #if defined(SK_ENABLE_SKOTTIE)
-    #include "SkottieSlide.h"
+    #include "tools/viewer/SkottieSlide.h"
 #endif
 
 #if !(defined(SK_BUILD_FOR_WIN) && defined(__clang__))
-    #include "NIMASlide.h"
+    #include "tools/viewer/NIMASlide.h"
 #endif
 
 using namespace sk_app;