Add initial Document::getAnnot supportchromium/2833

CL implements the first step in order to support
Annotations manipulation in PDFium: Document::getAnnot.

The method takes two arguments, an integer (page number)
and a string (annotation name).
When called, it iterates over the annotations on
the given page number, searching for the one whose name
matches the string in the second parameter.
If found, then an Annot instance (see Annot.cpp/g added by this
CL), is bound to a Javascript object and returned.

With the use cases described in bug [1] as an initial test case,
CL adds support to the following Annotation object properties:

- hidden
- name
- type

Idea is to keep evolving the implementation with more methods
and properties in follow up CLs.

[1] https://bugs.chromium.org/p/pdfium/issues/detail?id=492

BUG=pdfium:492

Review-Url: https://codereview.chromium.org/2260663002

1 files changed, 13 insertions, 1 deletions

diff --git a/testing/resources/javascript/document_methods.in b/testing/resources/javascript/document_methods.in
index 1c53dc24b5..bc0f3f1126 100644
--- a/testing/resources/javascript/document_methods.in
+++ b/testing/resources/javascript/document_methods.in
@@ -135,6 +135,18 @@ function testCalculateNow() {
    // TODO(tsepez): test success cases.
 }
 
+function testGetAnnot() {
+   // Method is present.
+   expect('typeof this.getAnnot', 'function');
+
+   // Method needs two arguments.
+   expectError('this.getAnnot()');
+   expectError('this.getAnnot(0)');
+   expectError('this.getAnnot(0, "test", 0)');
+
+   // TODO(tonikitoo): test success cases.
+}
+
 function testGetField() {
    // Method is present.
    expect('typeof this.getField', 'function');
@@ -289,7 +301,6 @@ try {
   testUnsupported('this.exportAsText');
   testUnsupported('this.exportAsXFDF');
   testUnsupported('this.extractPages');
-  testUnsupported('this.getAnnot');
   testUnsupported('this.getAnnot3D');
   testUnsupported('this.getAnnots');
   testUnsupported('this.getLinks');
@@ -307,6 +318,7 @@ try {
   app.alert('*** Testing Supported Methods ***');
   testAddIcon();
   testCalculateNow();
+  testGetAnnot();
   testGetField();
   testGetIcon();
   testGetNthFieldName();