Allow widevinecdmadapter to be built in Chromium with GN

third_party/widevine/cdm/BUILD.gn

Index: third_party/widevine/cdm/BUILD.gn
diff --git a/third_party/widevine/cdm/BUILD.gn b/third_party/widevine/cdm/BUILD.gn
index 3fce784ad36a59bdcca36b6239cac6b1cb12110a..10a61b97623e047043c9cbdf164a513f4e9ee5b4 100644
--- a/third_party/widevine/cdm/BUILD.gn
+++ b/third_party/widevine/cdm/BUILD.gn
@@ -5,6 +5,7 @@
 import("//build/config/features.gni")
 import("//chrome/version.gni")  # TODO layering violation
 import("//media/cdm/ppapi/cdm_adapter.gni")
+import("//third_party/widevine/cdm/widevine.gni")
 
 widevine_arch = current_cpu
 if (widevine_arch == "x86") {
@@ -37,6 +38,9 @@ if (is_android) {
     widevine_cdm_version_h_file = "widevine_cdm_version.h"
     widevine_cdm_binary_files = []
   }
+} else if (enable_widevine) {
+  widevine_cdm_version_h_file = "stub/widevine_cdm_version.h"
+  widevine_cdm_binary_files = []
 } else {
   # No branding, use the default one.
   widevine_cdm_version_h_file = "widevine_cdm_version.h"
@@ -57,28 +61,58 @@ copy("version_h") {
   ]
 }
 
-# GYP version: third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_binaries
-if (widevine_cdm_binary_files == []) {
-  group("binaries") {
-    # NOP
-  }
-} else {
-  copy("binaries") {
+# GYP version: third_party/widevine/cdm/widevine_cdm.gyp:widevinecdm
+if (widevine_cdm_binary_files != []) {
+  copy("widevinecdm") {
     sources = widevine_cdm_binary_files
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
 
-    # TODO(GYP)
+    # TODO(jrummell)
     # 'COPY_PHASE_STRIP': 'NO',
   }
+} else if (enable_widevine && enable_pepper_cdms) {
+  assert(!is_chrome_branded, "Branded Chrome should have binary files to copy.")
+  assert(!is_android, "Android should not have enable_pepper_cdms.")
+  shared_library("widevinecdm") {
+    sources = [
+      "//media/cdm/stub/stub_cdm.cc",
+      "//media/cdm/stub/stub_cdm.h",
+    ]
+
+    defines = [ "CDM_IMPLEMENTATION" ]
+
+    deps = [
+      ":version_h",
+      "//base",
+    ]
+
+    if (is_mac) {
+      ldflags = [
+        # Not to strip important symbols by -Wl,-dead_strip.
+        "-Wl,-exported_symbol,_PPP_GetInterface",
+        "-Wl,-exported_symbol,_PPP_InitializeModule",
+        "-Wl,-exported_symbol,_PPP_ShutdownModule",
+      ]
+      #TODO(jrummell) Mac: 'DYLIB_INSTALL_NAME_BASE': '@loader_path',
+    } else if (is_posix && !is_mac) {
+      cflags = [ "-fvisibility=hidden" ]
+      # Note GYP sets rpath but this is set by default on shared libraries in
+      # the GN build.
+    }
+  }
+} else {
+  group("widevinecdm") {
+    # NOP
+  }
 }
 
-if (is_chrome_branded && enable_pepper_cdms) {
+if ((is_chrome_branded || enable_widevine) && enable_pepper_cdms) {
   adapter_resource_file = "$target_gen_dir/widevinecdmadapter_version.rc"
 
   # Produce the .rc file.
-  process_version("adapter_resources") {
+  process_version("widevinecdmadapter_resources") {
     visibility = [ ":*" ]
     sources = [
       "BRANDING",
@@ -87,13 +121,13 @@ if (is_chrome_branded && enable_pepper_cdms) {
     output = adapter_resource_file
   }
 
-  cdm_adapter("adapter") {
+  cdm_adapter("widevinecdmadapter") {
     sources = [
       adapter_resource_file,
     ]
     deps = [
-      ":adapter_resources",
-      ":binaries",
+      ":widevinecdmadapter_resources",
+      ":widevinecdm",
       ":version_h",
       "//ppapi/cpp",
     ]
@@ -112,7 +146,7 @@ if (is_chrome_branded && enable_pepper_cdms) {
   }
 } else {
   # Placeholder when we're not compiling the adapter.
-  group("adapter") {
+  group("widevinecdmadapter") {
   }
 }
 
@@ -121,7 +155,7 @@ if (is_chrome_branded && enable_pepper_cdms) {
 source_set("widevine_test_license_server") {
   if (is_chrome_branded && is_linux) {
     deps = [
-      # TODO(GYP)
+      # TODO(jrummell)
       # This target should be removed and targets should have datadeps on this target:
       #"//third_party/widevine/test/license_server/license_server.gyp:test_license_server"
     ]