Make PrinterCapabilitiesTest run.

PrinterCapabilitiesTest is in printer_capabilities_unittest.cc inside
components/, but is not built as part of components_unittests. Instead,
it it built as part of components_browsertests, but does not appear in
the list of tests.

Fix the build rules so it builds in components_unittests as a proper
test. Move printer_capabilities_unittest.cc next to
printer_capabilities.cc.

Change-Id: I6be9606a97968e26de5528ee395e044d92f1ed9c
Reviewed-on: https://chromium-review.googlesource.com/c/1357616Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613269}

components/BUILD.gn

@@ -239,6 +239,7 @@ test("components_unittests") {
       "//components/policy/core/browser:unit_tests",
       "//components/policy/core/common:unit_tests",
       "//components/previews/content:unit_tests",
+      "//components/printing/common:unit_tests",
       "//components/safe_browsing/common:unit_tests",
       "//components/safe_browsing/password_protection:password_protection_unittest",
       "//components/safe_browsing/triggers:unit_tests",

components/printing/common/BUILD.gn

@@ -30,3 +30,18 @@ static_library("common") {
     "//ui/gfx/ipc/skia",
   ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "printer_capabilities_unittest.cc",
+  ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//content/test:test_support",
+    "//printing:test_support",
+    "//testing/gtest",
+  ]
+}

components/printing/common/DEPS

@@ -3,3 +3,9 @@ include_rules = [
   "+components/strings/grit",
   "+ui/base/l10n",
 ]
+
+specific_include_rules = {
+  "printer_capabilities_unittest.cc": [
+    "+content/public/test",
+  ],
+}

components/printing/test/BUILD.gn

@@ -12,7 +12,6 @@ static_library("test_support") {
     "print_mock_render_thread.h",
     "print_test_content_renderer_client.cc",
     "print_test_content_renderer_client.h",
-    "printer_capabilities_unittest.cc",
   ]
 
   public_deps = [