Full page google doc summarization support

[darkdh]

Test plan

See brave/brave-core#22612

Description

Current screenshot method can only extract text from pages in the viewport, it would be 1 or 2 pages depends on how big the screen is or zoom ratio.
We will use print preview extraction method to get full pages of context and then extract text from it.

[stephendonner]

Verification PASSED using

Brave | 1.66.103 Chromium: 124.0.6367.159 (Official Build) beta (x86_64)
-- | --
Revision | 74d46bb25d9ea5e6432e19f0cf38480cc372b0cf
OS | macOS Version 11.7.10 (Build 20G1427)

Shared Steps:

1. installed 1.67.52
2. launched Brave
3. clicked on Leo in the sidebar
4. entered test
5. clicked on I understand

Case 1: Regression test on previous Google Doc support - PASSED

• downloaded a newspaper template from https://thegoodocs.com/download
• copied it
• clicked on Summarize this page

Confirmed page summarization was accurate

Case 2: Test full-page Google Doc support - PASSED

• opened my Senior thesis (14 pages)
• clicked on Summarize this page

Confirmed accurate summary

Case 3: Test Google Docs page limit (20) - PASSED

• open a google doc with 19 pages of blank pages and 2 pages with completely different scoped of contents
• summarize the page

Summary should be only relevant to 20th page but not 21st page

Case 4: Compatibility with print dialog - PASSED

• open a Google Doc and print it
• when print dialog is open, open Leo panel and summarize the page
• summary should show up
• close print dialog and trigger print again

Confirmed correct Leo summarization and print-dialog functionality

example	example	example	example

[stephendonner]

Verification PASSED using

Brave | 1.66.103 Chromium: 124.0.6367.159 (Official Build) beta (64-bit)
-- | --
Revision | 74d46bb25d9ea5e6432e19f0cf38480cc372b0cf
OS | Windows 10 Version 22H2 (Build 19045.4355)

Shared Steps:

1. installed 1.66.103
2. launched Brave
3. clicked on Leo in the sidebar
4. entered test
5. clicked on I understand

Case 1: Regression test on previous Google Doc support - PASSED

• downloaded a newspaper template from https://thegoodocs.com/download
• copied it
• clicked on Summarize this page

Confirmed page summarization was accurate

Case 2: Test full-page Google Doc support - PASSED

• opened my Senior thesis (14 pages)
• clicked on Summarize this page

Confirmed accurate summary

Case 3: Test Google Docs page limit (20) - PASSED

• open a google doc with 19 pages of blank pages and 2 pages with completely different scoped of contents
• summarize the page

Summary should be only relevant to 20th page but not 21st page

Case 4: Compatibility with print dialog - PASSED

• open a Google Doc and print it
• when print dialog is open, open Leo panel and summarize the page
• summary should show up
• close print dialog and trigger print again

Confirmed correct Leo summarization and print-dialog functionality

example	example	example	example