Include sharing proc in skia static library when building for android.

So it can be used for SKP serialization.

Bug: 9203
Change-Id: I094d5222f220bb79c7f61fd5ebebf48e23e97b0b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223705
Commit-Queue: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index a254d32..bf97f83 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -60,6 +60,7 @@
   skia_llvm_lib = "LLVM"
 
   skia_tools_require_resources = false
+  skia_include_multiframe_procs = false
 }
 declare_args() {
   skia_use_dng_sdk = !is_fuchsia && skia_use_libjpeg_turbo && skia_use_zlib
@@ -1044,6 +1045,10 @@
     deps += [ "//third_party/spirv-tools" ]
     defines += [ "SK_ENABLE_SPIRV_VALIDATION" ]
   }
+
+  if (skia_include_multiframe_procs) {
+    sources += [ "tools/SkSharingProc.cpp" ]
+  }
 }
 
 # DebugCanvas used in experimental/wasm-skp-debugger