Add checks for android printing

printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java

Index: printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java
diff --git a/printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java b/printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java
index 3d8bbb057788ffe64357cdaf40fb46aa49b1d1e9..3900f5e680133b6ef61c63652a60f23f80c5d026 100644
--- a/printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java
+++ b/printing/android/java/src/org/chromium/printing/PrintingControllerImpl.java
@@ -12,8 +12,8 @@
 import android.print.PageRange;
 import android.print.PrintAttributes;
 import android.print.PrintDocumentInfo;
-import android.util.Log;
 
+import org.chromium.base.Log;
 import org.chromium.base.ThreadUtils;
 import org.chromium.printing.PrintDocumentAdapterWrapper.PdfGenerator;
 
@@ -31,8 +31,7 @@
  */
 @TargetApi(Build.VERSION_CODES.KITKAT)
 public class PrintingControllerImpl implements PrintingController, PdfGenerator {
-
-    private static final String LOG_TAG = "PrintingControllerImpl";
+    private static final String TAG = "cr.printing";
 
     /**
      * This is used for both initial state and a completed state (i.e. starting from either
@@ -181,7 +180,10 @@ public void setPrintingContext(final PrintingContextInterface printingContext) {
 
     @Override
     public void setPendingPrint(final Printable printable, PrintManagerDelegate printManager) {
-        if (mIsBusy) return;
+        if (mIsBusy) {
+            Log.d(TAG, "Pending print can't be set. PrintingController is busy.");
+            return;
+        }
         mPrintable = printable;
         mPrintManager = printManager;
     }
@@ -189,7 +191,9 @@ public void setPendingPrint(final Printable printable, PrintManagerDelegate prin
     @Override
     public void startPendingPrint(PrintingContextInterface printingContext) {
         if (mIsBusy || mPrintManager == null) {
-            Log.w(LOG_TAG, "Pending print can't be started. Is might be busy or not initialized.");
+            if (mIsBusy) Log.d(TAG, "Pending print can't be started. PrintingController is busy.");
+            else Log.d(TAG, "Pending print can't be started. No PrintManager provided.");
+
             if (printingContext != null) printingContext.showSystemDialogDone();
             return;
         }