Better tests for CJS_Field properties.

Fixes some longstanding issues
- Make x,y coordinates used in test have unique values from each other.
- run text widget tests on text widget, not its parent.
- run subset of these tests on the parent itself.
- provide some text values for the text widget.
- fix test helpers to compare distinct arrays/objects for "sameness".
- update an error message to indicate the problem is with caller
  argument, not the object bound across the fxjs interface.

Change-Id: I60834021b64eb275d3ec36bcdea7f71fc11d18ab
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/63390
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

testing/resources/javascript/field.fragment

diff --git a/testing/resources/javascript/field.fragment b/testing/resources/javascript/field.fragment
index 1dbcb0b..d366361 100644
--- a/testing/resources/javascript/field.fragment
+++ b/testing/resources/javascript/field.fragment
@@ -8,9 +8,7 @@
 {{object 2 0}} <<
   /Type /Pages
   /Count 1
-  /Kids [
-    3 0 R
-  ]
+  /Kids [3 0 R]
 >>
 endobj
 % Page number 0.
@@ -39,7 +37,7 @@
   /T (MyField)
   /Type /Annot
   /Subtype /Widget
-  /Rect [100 100 400 400]
+  /Rect [100 101 400 401]
   /Kids [
     6 0 R
     7 0 R
@@ -56,7 +54,9 @@
   /T (MyText)
   /Type /Annot
   /Subtype /Widget
-  /Rect [200 200 220 220]
+  /Rect [200 201 220 221]
+  /V (bleen)
+  /DV (grue)
 >>
 endobj
 {{object 7 0}} <<
@@ -66,7 +66,7 @@
   /T (MyPushButton)
   /Type /Annot
   /Subtype /Widget
-  /Rect [220 220 240 240]
+  /Rect [220 221 240 241]
 >>
 endobj
 {{object 8 0}} <<
@@ -76,7 +76,7 @@
   /T (MyRadio)
   /Type /Annot
   /Subtype /Widget
-  /Rect [240 240 260 260]
+  /Rect [240 241 260 261]
 >>
 endobj
 {{object 9 0}} <<
@@ -86,7 +86,7 @@
   /T (MyCheckBox)
   /Type /Annot
   /Subtype /Widget
-  /Rect [260 260 280 280]
+  /Rect [260 261 280 281]
 >>
 endobj
 {{object 10 0}} <<
@@ -96,7 +96,7 @@
   /T (MyMultiSelect)
   /Type /Annot
   /Subtype /Widget
-  /Rect [ 280 280 300 300 ]
+  /Rect [ 280 281 300 301 ]
   /Opt [ (foo) (bar) (qux) ]
   /V (qux)
 >>
@@ -108,7 +108,7 @@
   /T (MySingleSelect)
   /Type /Annot
   /Subtype /Widget
-  /Rect [ 300 300 320 320 ]
+  /Rect [ 300 301 320 321 ]
   /Opt [
     [ (foo) (Foo) ]
     [ (bar) (Bar) ]
@@ -116,7 +116,6 @@
   ]
 >>
 endobj
-
 % OpenAction action
 {{object 15 0}} <<
   /Type /Action