Fix forward declares and includes of some Skia Ganesh types (flutter/engine#40279)

Fix forward declares and includes of some Skia Ganesh types

engine/src/flutter/common/graphics/persistent_cache.h

@@ -15,6 +15,8 @@
 #include "flutter/fml/unique_fd.h"
 #include "third_party/skia/include/gpu/GrContextOptions.h"
 
+class GrDirectContext;
+
 namespace flutter {
 
 namespace testing {

engine/src/flutter/flow/embedded_views.h

@@ -22,6 +22,8 @@
 #include "third_party/skia/include/core/SkSize.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
+class GrDirectContext;
+
 namespace flutter {
 
 enum MutatorType {

engine/src/flutter/flow/layers/layer.h

@@ -33,6 +33,8 @@
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/utils/SkNWayCanvas.h"
 
+class GrDirectContext;
+
 namespace flutter {
 
 namespace testing {

engine/src/flutter/flow/layers/layer_tree.h

@@ -17,6 +17,8 @@
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/core/SkSize.h"
 
+class GrDirectContext;
+
 namespace flutter {
 
 class LayerTree {

engine/src/flutter/flow/layers/offscreen_surface.h

@@ -12,6 +12,8 @@
 #include "flutter/display_list/skia/dl_sk_canvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
+class GrDirectContext;
+
 namespace flutter {
 
 class OffscreenSurface {

engine/src/flutter/flow/raster_cache.h

@@ -19,6 +19,7 @@
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkSize.h"
 
+class GrDirectContext;
 class SkColorSpace;
 
 namespace flutter {

engine/src/flutter/flow/skia_gpu_object.h

@@ -13,6 +13,7 @@
 #include "flutter/fml/task_runner.h"
 #include "flutter/fml/trace_event.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/gpu/GrBackendSurface.h"
 #include "third_party/skia/include/gpu/GrDirectContext.h"
 
 namespace flutter {

engine/src/flutter/flow/surface.h

@@ -12,6 +12,8 @@
 #include "flutter/flow/surface_frame.h"
 #include "flutter/fml/macros.h"
 
+class GrDirectContext;
+
 namespace impeller {
 class AiksContext;
 }  // namespace impeller