Move build -> gn/standalone

Make it explicit that those gn files are only for the standalone
build.

Bug: 68710794
Change-Id: I7e2a15219d63b62bf8f249becfdbf39fda2cc183
diff --git a/.travis.yml b/.travis.yml
index e432830..3013aaa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -132,14 +132,14 @@
 install:
   - |
     if [[ "$CFG" != android-* ]]; then
-      build/install-build-deps --no-android
+      tools/install-build-deps --no-android
     else
-      build/install-build-deps
+      tools/install-build-deps
     fi
 
 script:
-  - build/gn gen out/dist --args="${GN_ARGS}" --check
-  - build/ninja -C out/dist -j8 all
+  - tools/gn gen out/dist --args="${GN_ARGS}" --check
+  - tools/ninja -C out/dist -j8 all
   - |
     TEST_TARGETS="
     perfetto_tests
@@ -151,9 +151,9 @@
       done
     else
       TARGET_ARCH=$(echo $CFG | cut -d- -f3)
-      build/run_android_emulator $TARGET_ARCH --pid /tmp/emulator.pid -v &
+      tools/run_android_emulator $TARGET_ARCH --pid /tmp/emulator.pid -v &
       for TEST_TARGET in $TEST_TARGETS; do
-        build/run_android_test out/dist "$TEST_TARGET"
+        tools/run_android_test out/dist "$TEST_TARGET"
       done
     fi