Selectively perform JNI registration in render processes on Android.

content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java

Index: content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java
diff --git a/content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java b/content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java
index 0deff1fa93b9987ad7a3a816b74c37e8ce9c9414..09b1c5f91cf91b24d2e4a98db0f633b23c401fed 100644
--- a/content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java
+++ b/content/public/android/java/src/org/chromium/content/app/ChildProcessServiceImpl.java
@@ -19,6 +19,7 @@ import android.view.Surface;
 import org.chromium.base.BaseSwitches;
 import org.chromium.base.CommandLine;
 import org.chromium.base.ContextUtils;
+import org.chromium.base.JNIUtils;
 import org.chromium.base.Log;
 import org.chromium.base.UnguessableToken;
 import org.chromium.base.annotations.CalledByNative;
@@ -192,6 +193,10 @@ public class ChildProcessServiceImpl {
                     }
                     CommandLine.init(mCommandLineParams);
 
+                    if ("renderer".equals(CommandLine.getInstance().getSwitchValue("type"))) {

[Ted C, 2017/01/31 17:56:54]

Sad to kill your 100 char perfect line, but I think this should be:

if (ContentSwitches.SWITCH_RENDERER_PROCESS.equals(
        CommandLine.getInstance().getSwitchValue(
                ContentSwitches.SWITCH_PROCESS_TYPE))) {

Also, tangent...any idea why we have ContentSwitches.getSwitchValue and the
corresponding one in CommandLine?

[estevenson, 2017/01/31 18:56:41]

:(. Done.

Not sure, my best guess is that ContentSwitches.getSwitchValue was probably
added so that ChildProcessLauncher can use it
(https://cs.chromium.org/chromium/src/content/public/android/java/src/org/chro...)
since the CommandLine instance isn't created until the child process is set up?

+                        JNIUtils.enableSelectiveJniRegistration();
+                    }
+
                     Linker linker = null;
                     boolean requestedSharedRelro = false;
                     if (Linker.isUsed()) {