Generate ChromeVersionConstants.java at build time.

chrome/chrome_android.gypi

Index: chrome/chrome_android.gypi
diff --git a/chrome/chrome_android.gypi b/chrome/chrome_android.gypi
index a1ec31a754a940392b0ce605b1a99a536d7391fd..b69610ea95f0cd25c4658819faad4caac20bb496 100644
--- a/chrome/chrome_android.gypi
+++ b/chrome/chrome_android.gypi
@@ -51,5 +51,58 @@
         ],
       },
     },
+    {
+      'target_name': 'chrome_version_java',
+      'type': 'none',
+      'variables': {
+        'template_input_path': 'android/java/ChromeVersionConstants.java.version',
+        'version_path': 'VERSION',
+        'version_py_path': '<(DEPTH)/build/util/version.py',
+        'output_path': '<(SHARED_INTERMEDIATE_DIR)/templates/org/chromium/chrome/browser/ChromeVersionConstants.java',
+
+        'conditions': [
+          ['branding == "Chrome"', {
+            'branding_path': 'app/theme/google_chrome/BRANDING',
+          }, {
+            'branding_path': 'app/theme/chromium/BRANDING',
+          }],
+        ],
+      },
+      'direct_dependent_settings': {
+        'variables': {
+          # Ensure that the output directory is used in the class path
+          # when building targets that depend on this one.
+          'generated_src_dirs': [
+            '<(SHARED_INTERMEDIATE_DIR)/templates',

[newt (away), 2014/10/09 21:53:04]

Chris, do you think putting the generated Java file in this shared templates
directory is causing the compile failures on various try bots? e.g.

    FAILED: cd ../../chrome; python ../build/android/gyp/dex.py ...

    UNEXPECTED TOP-LEVEL EXCEPTION:
    com.android.dex.DexException: Multiple dex files define
Lorg/chromium/base/library_loader/NativeLibraries;

http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...

[cjhopman, 2014/10/09 22:07:29]

Yeah, that would do it. I see that we do this other places... we really
shouldn't. All targets that generate sources should have their own unique root.

I would suggest changing the output path to
<(SHARED_INTERMEDIATE_DIR)/templates/<(_target_name)/...

It looks like nobody passes <(SHARED_INTERMEDIATE_DIR)/templates as a
generated_src_dir so it should work.

+          ],
+          # Ensure dependents are rebuilt when the generated Java file changes.
+          'additional_input_paths': [
+            '<(output_path)',
+          ],
+        },
+      },
+      'actions': [
+        {
+          'action_name': 'chrome_version_java_template',
+          'inputs': [
+            '<(template_input_path)',
+            '<(version_path)',
+            '<(branding_path)',
+            '<(version_py_path)',
+          ],
+          'outputs': [
+            '<(output_path)',
+          ],
+          'action': [
+            'python',
+            '<(version_py_path)',
+            '-f', '<(version_path)',
+            '-f', '<(branding_path)',
+            '<(template_input_path)',
+            '<(output_path)',
+          ],
+        },
+      ],
+    },
   ],
 }