Android: add logging when allocating and freeing renderer services.

This will help to investigate cases of Chrome running out of renderer
services on Android.

BUG=396568
R=yfriedman@chromium.org

Review URL: https://codereview.chromium.org/464403002

Cr-Commit-Position: refs/heads/master@{#289505}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289505 0039d316-1c4b-4281-b951-d872f2087c98

content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java

@@ -101,6 +101,8 @@ public class ChildProcessLauncher {
                 assert mChildProcessConnections[slot] == null;
                 mChildProcessConnections[slot] = new ChildProcessConnectionImpl(context, slot,
                         mInSandbox, deathCallback, mChildClass, chromiumLinkerParams);
+                Log.d(TAG, "Allocator allocated a connection, sandbox: " + mInSandbox +
+                        ", slot: " + slot);
                 return mChildProcessConnections[slot];
             }
         }
@@ -118,6 +120,8 @@ public class ChildProcessLauncher {
                     mChildProcessConnections[slot] = null;
                     assert !mFreeConnectionIndices.contains(slot);
                     mFreeConnectionIndices.add(slot);
+                    Log.d(TAG, "Allocator freed a connection, sandbox: " + mInSandbox +
+                            ", slot: " + slot);
                 }
             }
         }