Restructure public side of view_manager service.

services/view_manager/BUILD.gn

Index: services/view_manager/BUILD.gn
diff --git a/services/view_manager/BUILD.gn b/services/view_manager/BUILD.gn
index ca21132b1b2d7823f61409252f87b3d1e9a04e67..ff8de6fd8a5a58aeb1f81e6aa0b78114a71c33d8 100644
--- a/services/view_manager/BUILD.gn
+++ b/services/view_manager/BUILD.gn
@@ -70,8 +70,8 @@ source_set("view_manager_lib") {
     "//mojo/services/public/interfaces/input_events",
     "//mojo/services/public/interfaces/native_viewport",
     "//mojo/services/public/interfaces/surfaces",
-    "//mojo/services/public/interfaces/view_manager",
-    "//mojo/services/public/cpp/view_manager:common",
+    "//mojo/services/view_manager/public/interfaces",
+    "//mojo/services/view_manager/public/cpp:common",
     "//mojo/services/window_manager/public/interfaces",
     "//ui/gfx",
     "//ui/gfx/geometry",
@@ -90,9 +90,9 @@ source_set("test_support") {
     "//base",
     "//mojo/common",
     "//mojo/public/cpp/bindings:bindings",
-    "//mojo/services/public/cpp/view_manager:common",
     "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/view_manager",
+    "//mojo/services/view_manager/public/cpp:common",
+    "//mojo/services/view_manager/public/interfaces",
   ]
 }
 
@@ -118,9 +118,9 @@ test("view_manager_service_unittests") {
     "//mojo/public/cpp/bindings",
     "//mojo/public/interfaces/application",
     "//mojo/services/public/cpp/native_viewport:args",
-    "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/view_manager",
+    "//mojo/services/view_manager/public/cpp",
+    "//mojo/services/view_manager/public/interfaces",
     "//mojo/services/window_manager/public/interfaces",
     "//testing/gtest",
     "//ui/gfx",
@@ -148,7 +148,7 @@ mojo_native_application("view_manager_service_apptests") {
     "//mojo/common",
     "//mojo/public/cpp/bindings",
     "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/view_manager",
+    "//mojo/services/view_manager/public/interfaces",
     "//mojo/services/window_manager/public/interfaces",
   ]
 }