bazel: Fix resource paths as external repo (see #3757)

- Headers that are included by .rc files need to be supplied to
  `declare_exe` via the `resources_deps` attribute (passed as the `deps
  attribute to `compile_rc`). The headers must be part of a cc_library
  target via either the `hdrs` or `srcs` attribute.
- File paths for CEF resources are prefixed with "external/<repo>"
  when CEF is loaded as an external repo. Update `copy_filegroups` to
  work with these paths.

bazel/copy_filegroups.bzl

@@ -10,12 +10,16 @@ def _copy_filegroups_impl(ctx):
     outputs = []
     for f in inputs:
         relative_path = f.path
+        if relative_path.startswith("external/"):
+          # Remove the "external/<repo>" component, if any.
+          relative_path = "/".join(relative_path.split("/")[2:])
+
         for prefix in remove_prefixes:
             # Add trailing forward slash if necessary.
             if prefix[-1] != "/":
                 prefix += "/"
-            if len(prefix) > 0 and f.path.startswith(prefix):
-                relative_path = f.path[len(prefix):]
+            if len(prefix) > 0 and relative_path.startswith(prefix):
+                relative_path = relative_path[len(prefix):]
                 break
 
         if len(add_prefix) > 0:

tools/distrib/bazel/tests-cefclient-BUILD.bazel.in

@@ -81,10 +81,10 @@ objc_library(
 # Windows targets.
 #
 
-# Allow access from the declare_exe target.
-filegroup(
+# Allow access to resource.h from the declare_exe target.
+cc_library(
     name = "ResourceH",
-    srcs = [
+    hdrs = [
         "browser/resource.h"
     ]
 )

tools/distrib/bazel/tests-cefclient-win-BUILD.bazel

@@ -43,12 +43,14 @@ declare_exe(
         "{}.exe.manifest".format(PRODUCT_NAME),
     ],
     resources_srcs = [
-        "{}:ResourceH".format(PKG_NAME),
         "{}:Resources".format(PKG_NAME),
         "{}.ico".format(PRODUCT_NAME),
         "small.ico",
         "//tests/shared:Resources",
     ],
+    resources_deps = [
+        "{}:ResourceH".format(PKG_NAME),
+    ],
     linkopts = [
         "/SUBSYSTEM:WINDOWS",
     ] + [

tools/distrib/bazel/tests-cefsimple-BUILD.bazel.in

@@ -66,10 +66,10 @@ cc_library(
 # Windows targets.
 #
 
-# Allow access from the declare_exe target.
-filegroup(
+# Allow access to resource.h from the declare_exe target.
+cc_library(
     name = "ResourceH",
-    srcs = [
+    hdrs = [
         "resource.h"
     ]
 )

tools/distrib/bazel/tests-cefsimple-win-BUILD.bazel

@@ -27,10 +27,12 @@ declare_exe(
         "{}.exe.manifest".format(PRODUCT_NAME),
     ],
     resources_srcs = [
-        "{}:ResourceH".format(PKG_NAME),
         "{}.ico".format(PRODUCT_NAME),
         "small.ico",
     ],
+    resources_deps = [
+        "{}:ResourceH".format(PKG_NAME),
+    ],
     linkopts = [
         "/SUBSYSTEM:WINDOWS",
     ],

tools/distrib/bazel/tests-ceftests-BUILD.bazel.in

@@ -81,10 +81,10 @@ objc_library(
 # Windows targets.
 #
 
-# Allow access from the declare_exe target.
-filegroup(
+# Allow access to resource.h from the declare_exe target.
+cc_library(
     name = "ResourceH",
-    srcs = [
+    hdrs = [
         "resource.h"
     ]
 )

tools/distrib/bazel/tests-ceftests-win-BUILD.bazel

@@ -45,11 +45,13 @@ declare_exe(
         "{}.exe.manifest".format(PRODUCT_NAME),
     ],
     resources_srcs = [
-        "{}:ResourceH".format(PKG_NAME),
         "{}.ico".format(PRODUCT_NAME),
         "small.ico",
         "//tests/shared:Resources",
     ],
+    resources_deps = [
+        "{}:ResourceH".format(PKG_NAME),
+    ],
     linkopts = [
         "/SUBSYSTEM:CONSOLE",
     ],