Indexing native application data

1. A computer-implemented method comprising:

executing, on a mobile device associated with a particular user, a particular native application;

sending, to a search engine from the mobile device, a set of data that is generated by the particular native application on the mobile device, the set of data including (i) data that identifies the particular native application, and (ii) a representation of viewed content, the viewed content being content that was displayed by the particular native application on the user device and determined to be viewed by the particular user;

executing, on the mobile device, an application that is different from the particular native application;

receiving a query as input in the application at the mobile device;

sending, to the search engine and from the mobile device, the query;

receiving, from the search engine, search results that include at least one search result that references the viewed content, the at least one search result having been generated in response to a query by the particular user and the set of data generated by the native application and sent to the search engine; and

displaying, at the mobile device, the search results.

2. The method of claim 1 , wherein the representation of viewed content includes keywords from the viewed content, or an identifier associated with the viewed content.

3. The method of claim 1 , wherein the set of data further includes an access control list that specifies whether the viewed content is classified as private content or public content.

4. The method of claim 1 , wherein the at least one search result includes a link to the viewed content that, when selected, launches the viewed content in the particular native application.

5. The method of claim 1 , wherein the application that is different from the native application is a web browser.

6. The method of claim 1 , wherein the application that is different from the native application is a search application.

7. A mobile device comprising:

computer hardware, including a communication system, a processor system, and an input/output system; and

a non-transitory computer-readable medium coupled to the computer hardware and having instructions stored thereon, which, when executed by the computer hardware, cause the computer hardware to perform operations comprising:

executing, on a mobile device associated with a particular user, a particular native application;

sending, to a search engine from the mobile device, a set of data that is generated by the particular native application on the mobile device, the set of data including (i) data that identifies the particular native application, and (ii) a representation of viewed content, the viewed content being content that was displayed by the particular native application on the user device and determined to be viewed by the particular user;

executing, on the mobile device, an application that is different from the particular native application;

receiving a query as input in the application at the mobile device;

sending, to the search engine and from the mobile device, the query;

receiving, from the search engine, search results that include at least one search result that references the viewed content, the at least one search result having been generated in response to a query by the particular user and the set of data generated by the native application and sent to the search engine; and

displaying, at the mobile device, the search results.

8. The system of claim 7 , wherein the representation of viewed content includes keywords from the viewed content, or an identifier associated with the viewed content.

9. The system of claim 7 , wherein the set of data further includes an access control list that specifies whether the viewed content is classified as private content or public content.

10. The system of claim 7 , wherein the at least one search result includes a link to the viewed content that, when selected, launches the viewed content in the particular native application.

11. The system of claim 7 , wherein the application that is different from the native application is a web browser.

12. The system of claim 7 , wherein the application that is different from the native application is a search application.

13. A non-transitory computer-readable medium and having instructions stored thereon, which, when executed by the mobile device, cause the mobile device to perform operations comprising:

executing, on a mobile device associated with a particular user, a particular native application;

sending, to a search engine from the mobile device, a set of data that is generated by the particular native application on the mobile device, the set of data including (i) data that identifies the particular native application, and (ii) a representation of viewed content, the viewed content being content that was displayed by the particular native application on the user device and determined to be viewed by the particular user;

executing, on the mobile device, an application that is different from the particular native application;

receiving a query as input in the application at the mobile device;

sending, to the search engine and from the mobile device, the query;

receiving, from the search engine, search results that include at least one search result that references the viewed content, the at least one search result having been generated in response to a query by the particular user and the set of data generated by the native application and sent to the search engine; and

displaying, at the mobile device, the search results.