[AW] Add missing //aw/public dependencies.

//aw/test:libstandalonelibwebviewchromium and //aw/browser/gfx:gfx
depend on //aw/public headers but don't explicitly declare the
dependency. See the comments in crrev.com/c/1764341 for more context.

Test: autoninja -C out/aw webview_instrumentation_apk
Test: gn check out/aw
Bug: 934152
Change-Id: I0d437f7a6dc34a3ff42b3daf9ed7d41bab8a1c59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055692
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742365}

android_webview/browser/gfx/BUILD.gn

@@ -75,6 +75,7 @@ source_set("gfx") {
   deps = [
     "//android_webview:browser_jni_headers",
     "//android_webview/common",
+    "//android_webview/public",
     "//base",
     "//components/ui_devtools:buildflags",
     "//components/viz/service",

android_webview/test/BUILD.gn

@@ -150,6 +150,7 @@ shared_library("libstandalonelibwebviewchromium") {
     "//android_webview/lib",
     "//android_webview/lib:webview_entry_point",
     "//android_webview/nonembedded",
+    "//android_webview/public",
     "//base",
     "//components/heap_profiling:test_support",
     "//content/public/test/android:content_native_test_support",