Bug 1921707 - absl.gni - filter dep paths from '//third_party/abseil-cpp/' to '//' r=ng

Differential Revision: https://phabricator.services.mozilla.com/D224080

third_party/abseil-cpp/absl.gni

@@ -86,6 +86,43 @@ template("absl_source_set") {
       }
     }
     visibility += [ "//abseil-cpp/*" ]
+
+    # Now that abseil-cpp lives under Mozilla's third_party instead
+    # of under libwebrtc's third_party and is built as a stand-alone
+    # library, we need to "re-root" the dependency paths.  We can
+    # modify the dependencies here to avoid modifying most, if not
+    # all, of the BUILD.gn files.
+    if (defined(deps)) {
+      modified_deps = []
+      foreach (dep, deps) {
+        newdep = string_replace(dep, "//third_party/abseil-cpp/", "//")
+        modified_deps += [ newdep ]
+      }
+      deps = []
+      deps = modified_deps
+    }
+
+    # Same for public_deps
+    if (defined(public_deps)) {
+      modified_deps = []
+      foreach (dep, public_deps) {
+        newdep = string_replace(dep, "//third_party/abseil-cpp/", "//")
+        modified_deps += [ newdep ]
+      }
+      public_deps = []
+      public_deps = modified_deps
+    }
+
+    # Same for visibility
+    if (defined(visibility)) {
+      modified_deps = []
+      foreach (dep, visibility) {
+        newdep = string_replace(dep, "//third_party/abseil-cpp/", "//")
+        modified_deps += [ newdep ]
+      }
+      visibility = []
+      visibility = modified_deps
+    }
   }
 }
 
@@ -111,5 +148,20 @@ template("absl_test") {
       "//third_party/googletest:gmock",
       "//third_party/googletest:gtest",
     ]
+
+    # Now that abseil-cpp lives under Mozilla's third_party instead
+    # of under libwebrtc's third_party and is built as a stand-alone
+    # library, we need to "re-root" the dependency paths.  We can
+    # modify the dependencies here to avoid modifying most, if not
+    # all, of the BUILD.gn files.
+    if (defined(deps)) {
+      modified_deps = []
+      foreach (dep, deps) {
+        newdep = string_replace(dep, "//third_party/abseil-cpp/", "//")
+        modified_deps += [ newdep ]
+      }
+      deps = []
+      deps = modified_deps
+    }
   }
 }