Bundle fake Widevine component manifest for stub CDM

Encrypted media browser tests involving Widevine use the stub CDM when
branding != Chrome.  This change allows them to register the
preinstalled component containing the stub CDM.

BUG=622273

TEST=Widevine browser tests 'browser_tests --gtest_filter=*Widevine*' pass

Review-Url: https://codereview.chromium.org/2136983002
Cr-Commit-Position: refs/heads/master@{#414706}

chrome/BUILD.gn

@@ -14,6 +14,7 @@ import("//build/config/win/manifest.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
+import("//third_party/widevine/cdm/widevine.gni")
 import("//ui/base/ui_features.gni")
 import("//v8/gni/v8.gni")
 
@@ -844,21 +845,42 @@ if (is_win) {
     }
   }
 
-  if (is_chrome_branded) {
+  _should_bundle_widevine =
+      (is_chrome_branded || enable_widevine) && enable_pepper_cdms
+  if (_should_bundle_widevine) {
+    # The Widevine CDM and manifest are either the actual Widevine CDM and
+    # manifest or stubs used for testing only. The choice is made within the
+    # corresponding Widevine targets based on branding.
     bundle_data("widevine_cdm_library_binaries") {
       sources = [
-        "$root_out_dir/$widevine_cdm_path/libwidevinecdm.dylib",
+        "$root_out_dir/libwidevinecdm.dylib",
         "$root_out_dir/$widevine_cdm_path/widevinecdmadapter.plugin",
       ]
       outputs = [
         "{{bundle_root_dir}}/Libraries/$widevine_cdm_path/{{source_file_part}}",
       ]
       public_deps = [
-        "//third_party/widevine/cdm:widevinecdm",
+        # Need this intermediate dependency because "widevinecdm" is a
+        # shared_library if !is_chrome_branded, and then depending on
+        # "widevinecdm" directly would cause it to be linked into the Chromium
+        # Framework, which we don't want.
+        ":widevine_cdm_library_copy",
         "//third_party/widevine/cdm:widevinecdmadapter",
       ]
     }
 
+    copy("widevine_cdm_library_copy") {
+      sources = [
+        "$root_out_dir/$widevine_cdm_path/libwidevinecdm.dylib",
+      ]
+      outputs = [
+        "$root_out_dir/{{source_file_part}}",
+      ]
+      deps = [
+        "//third_party/widevine/cdm:widevinecdm",
+      ]
+    }
+
     bundle_data("widevine_cdm_library_manifest") {
       sources = [
         "$root_out_dir/WidevineCdm/manifest.json",
@@ -873,7 +895,7 @@ if (is_win) {
   }
 
   group("widevine_cdm_library") {
-    if (is_chrome_branded) {
+    if (_should_bundle_widevine) {
       deps = [
         ":widevine_cdm_library_binaries",
         ":widevine_cdm_library_manifest",

third_party/widevine/cdm/BUILD.gn

@@ -45,6 +45,7 @@ if (is_android) {
   }
 } else if (enable_widevine) {
   widevine_cdm_version_h_file = "stub/widevine_cdm_version.h"
+  widevine_cdm_manifest_file = [ "stub/manifest.json" ]
 } else {
   # No branding, use the default one.
   widevine_cdm_version_h_file = "widevine_cdm_version.h"

third_party/widevine/cdm/stub/manifest.json

+{
+  "manifest_version": 2,
+  "name": "WidevineCdm",
+  "description": "Widevine Content Decryption Module Stub",
+  "offline_enabled": false,
+  "version": "0.0.0.000",
+  "minimum_chrome_version": "54.0.0.0",
+  "x-cdm-module-versions": "4",
+  "x-cdm-interface-versions": "8",
+  "x-cdm-host-versions": "8",
+  "x-cdm-codecs": "vp8,vp9.0,avc1",
+  "platforms": [
+    {
+      "os": "win",
+      "arch": "x86",
+      "sub_package_path": "_platform_specific/win_x86/"
+    },
+    {
+      "os": "win",
+      "arch": "x64",
+      "sub_package_path": "_platform_specific/win_x64/"
+    },
+    {
+      "os": "mac",
+      "arch": "x64",
+      "sub_package_path": "_platform_specific/mac_x64/"
+    }
+  ]
+}