Fix javadoc warnings in cronet's UploadDataProviders.java

components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java

Index: components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java
diff --git a/components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java b/components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java
index 317bc32a808f9271cfc01c71356645a89b494a93..2bc694b731ffb4027291fc9631c657fce96cf62d 100644
--- a/components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java
+++ b/components/cronet/android/api/src/org/chromium/net/UploadDataProviders.java
@@ -20,6 +20,7 @@ public final class UploadDataProviders {
      * Uploads an entire file.
      *
      * @param file The file to upload
+     * @return A new UploadDataProvider for the given file
      */
     public static UploadDataProvider create(final File file) {
         return new FileUploadProvider(new FileChannelProvider() {
@@ -35,6 +36,7 @@ public final class UploadDataProviders {
      *
      * @param fd The file descriptor to upload
      * @throws IllegalArgumentException if {@code fd} is not a file.
+     * @return A new UploadDataProvider for the given file descriptor
      */
     public static UploadDataProvider create(final ParcelFileDescriptor fd) {
         return new FileUploadProvider(new FileChannelProvider() {
@@ -52,17 +54,29 @@ public final class UploadDataProviders {
 
     /**
      * Uploads a ByteBuffer, from the current {@code buffer.position()} to {@code buffer.limit()}
+     * @param buffer The data to upload
+     * @return A new UploadDataProvider for the given buffer
      */
     public static UploadDataProvider create(ByteBuffer buffer) {
         return new ByteBufferUploadProvider(buffer.slice());
     }
 
-    /** Uploads {@code length} bytes from {@code data}, starting from {@code offset} */
+    /**
+     * Uploads {@code length} bytes from {@code data}, starting from {@code offset}
+     * @param data Array containing data to upload
+     * @param offset Offset within data to start with
+     * @param length Number of bytes to upload
+     * @return A new UploadDataProvider for the given data
+     */
     public static UploadDataProvider create(byte[] data, int offset, int length) {
         return new ByteBufferUploadProvider(ByteBuffer.wrap(data, offset, length));
     }
 
-    /** Uploads the contents of {@code data} */
+    /**
+     * Uploads the contents of {@code data}
+     * @param data Array containing data to upload
+     * @return A new UploadDataProvider for the given data
+     */
     public static UploadDataProvider create(byte[] data) {
         return create(data, 0, data.length);
     }