Don't limit concurrent javac executions when goma is enabled

Bug: 726475
Change-Id: Ic1e675edb3fc170ea238193e1b75405511527335
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2075038
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744675}

build/config/android/BUILD.gn

@@ -153,3 +153,10 @@ config("default_orderfile_instrumentation") {
     }
   }
 }
+
+if (current_toolchain == default_toolchain) {
+  pool("goma_javac_pool") {
+    # Override action_pool when goma is enabled for javac.
+    depth = 10000
+  }
+}

build/config/android/internal_rules.gni

@@ -2792,6 +2792,9 @@ if (enable_java_templates) {
       }
       if (use_java_goma) {
         args += [ "--gomacc-path=$goma_dir/gomacc" ]
+
+        # Override the default action_pool when goma is enabled.
+        pool = "//build/config/android:goma_javac_pool"
       }
       if (defined(invoker.srcjar_filearg)) {
         args += [ "--java-srcjars=${invoker.srcjar_filearg}" ]