Make absolute and sort all Sky headers

sky/engine/platform/BUILD.gn

Index: sky/engine/platform/BUILD.gn
diff --git a/sky/engine/platform/BUILD.gn b/sky/engine/platform/BUILD.gn
index 0252008004756277f9f272ce5b031137f1163a21..1b8d1a410e7d50c0834c72f6f8b871b8090aec45 100644
--- a/sky/engine/platform/BUILD.gn
+++ b/sky/engine/platform/BUILD.gn
@@ -417,6 +417,7 @@ component("platform") {
     "graphics/ThreadSafeDataTransport.h",
     "graphics/UnacceleratedImageBufferSurface.cpp",
     "graphics/UnacceleratedImageBufferSurface.h",
+    "heap/Handle.h",
     "HostWindow.h",
     "image-decoders/bmp/BMPImageDecoder.cpp",
     "image-decoders/bmp/BMPImageDecoder.h",
@@ -648,13 +649,14 @@ component("platform") {
     "//base:base",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//mojo/application",
-    "//mojo/common:common",
+    "//mojo/common",
+    "//mojo/environment:chromium",
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
+    "//mojo/services/public/interfaces/network",
     "//skia",
-    "//sky/engine/platform/heap",
     "//sky/engine/wtf",
     "//third_party/harfbuzz-ng",
     "//third_party/iccjpeg",
@@ -663,14 +665,6 @@ component("platform") {
     "//third_party/ots",
     "//third_party/qcms",
     "//third_party:jpeg",
-    "//mojo/common",
-    "//mojo/environment:chromium",
-    "//mojo/public/c/system:for_shared_library",
-    "//mojo/public/cpp/bindings",
-    "//mojo/public/cpp/utility",
-    "//mojo/services/public/interfaces/network",
-    "//sky/engine/wtf",
-    "//sky/engine/platform/heap",
     "//url",
     "//v8",
   ]