Merge "Support RTL in notification section header" into qt-dev

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:layout_marginLeft="@dimen/notification_section_header_padding_left"

            android:layout_marginStart="@dimen/notification_section_header_padding_left"

            android:text="@string/notification_section_header_gentle"

            android:textSize="12sp"

            android:textColor="@color/notification_section_header_label_color"

            android:id="@+id/btn_clear_all"

            android:layout_width="@dimen/notification_section_header_height"

            android:layout_height="@dimen/notification_section_header_height"

            android:layout_marginRight="4dp"

            android:layout_marginEnd="4dp"

            android:src="@drawable/status_bar_notification_section_header_clear_btn"

            android:contentDescription="@string/accessibility_notification_section_header_gentle_clear_all"

            />