Introduces Android API level linting, fixes all current API lint errors.

talk/app/webrtc/java/lint/suppressions.xml

Index: talk/app/webrtc/java/lint/suppressions.xml
diff --git a/talk/app/webrtc/java/lint/suppressions.xml b/talk/app/webrtc/java/lint/suppressions.xml
new file mode 100644
index 0000000000000000000000000000000000000000..7d1df4ca8ab5503a2d6db1ed02dcef1946622ec9
--- /dev/null
+++ b/talk/app/webrtc/java/lint/suppressions.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>

[kjellander_webrtc, 2015/11/12 13:02:18]

I think it makes more sense for us to have a global suppressions file in
webrtc/build/android/lint/suppressions.xml that applies to all projects.
Then it also matches the Chromium one we're overriding
(https://code.google.com/p/chromium/codesearch#chromium/src/build/android/lint...).
I've been doing that with other files, like the
webrtc/build/android/test_runner.py.

[phoglund, 2015/11/12 13:21:34]

Done.

+<lint>
+  <issue id="NewApi"></issue>
+
+  <issue id="Locale" severity="ignore"/>
+  <issue id="SdCardPath" severity="ignore"/>
+  <issue id="UseValueOf" severity="ignore"/>
+  <issue id="InlinedApi" severity="ignore"/>
+  <issue id="DefaultLocale" severity="ignore"/>
+  <issue id="Assert" severity="ignore"/>
+  <issue id="UseSparseArrays" severity="ignore"/>
+
+  <!-- These are just from the dummy AndroidManifest.xml we use for linting.
+       That file is located at app/webrtc/java/lint/AndroidManifest.xml. -->

[kjellander_webrtc, 2015/11/12 13:02:18]

If you agree with the above this line needs to be removed.

[phoglund, 2015/11/12 13:21:34]

Well, they're still needed, but the file will be in a different location. I just
updated the comment.

+  <issue id="MissingApplicationIcon" severity="ignore"/>
+  <issue id="AllowBackup" severity="ignore"/>
+  <issue id="MissingVersion" severity="ignore"/>
+</lint>