[Mac/GN] Properly set the install_name and rpath for shared_library targets and their consumers.

BUILD.gn

@@ -369,6 +369,14 @@ static_library("libANGLE") {
   }
 }
 
+config("shared_library_public_config") {
+  if (is_mac && !is_component_build) {
+    # Executable targets that depend on the shared libraries below need to have
+    # the rpath setup in non-component build configurations.
+    ldflags = [ "-rpath", "@executable_path/" ]
+  }
+}
+
 shared_library("libGLESv2") {
   sources = rebase_path(gles_gypi.libglesv2_sources, ".", "src")
 
@@ -377,6 +385,11 @@ shared_library("libGLESv2") {
         [ "/DEF:" + rebase_path("src/libGLESv2/libGLESv2.def", root_build_dir) ]
   }
 
+  if (is_mac && !is_component_build) {
+    ldflags = [ "-install_name", "@rpath/${target_name}.dylib" ]
+    public_configs = [ ":shared_library_public_config" ]
+  }
+
   configs -= angle_undefine_configs
   configs += [
     ":internal_config",
@@ -401,6 +414,11 @@ shared_library("libEGL") {
     ldflags = [ "/DEF:" + rebase_path("src/libEGL/libEGL.def", root_build_dir) ]
   }
 
+  if (is_mac && !is_component_build) {
+    ldflags = [ "-install_name", "@rpath/${target_name}.dylib" ]
+    public_configs = [ ":shared_library_public_config" ]
+  }
+
   configs -= angle_undefine_configs
   configs += [
     ":internal_config",